Did you screenshot the chat? If not, always screenshot stuff like that. Don't post it anywhere, but offer the screenshot proof when reporting the cheating through the proper channels. If that doesn't work, then I don't know what else you could do. There really is no recourse aside from reporting this kind of thing as far as I know.
Clear cheaters not getting banned?

They will readjust your score when they realize you've been cheated and send you a message stating as such.

being able to come back from a hopeless position would seem to indicate to me the position was never hopeless

The chat thing also could have been a joke.
As you become a stronger player you will be able to notice more cheating trends
Chess.com's cheating analysis is a refined system

Randomly while looking at team matches I came across this profile which was banned for "fair play" so, they do ban people: https://www.chess.com/member/amanda_ruby
I have had quite a few cheaters that I know of and I usually have no idea during the game, because I am not very good, and the only reason I know is because chess.com sends out these messages:
>
We have detected that one or more of your recent opponents has violated our Fair Play Policy. As compensation for potentially unfair rating losses, we adjusted your following ratings:
Rapid: 1226 + 9 => 1235

Chess.com has arguably THE best support team for anything, if you think he cheated look through his other games and report him if you are suspicious of them, I’m personally 2050 in blitz but I once beat a 2600, these things can happen when you get nervous usually

This is off topic but I’ve had some people accuse me of cheating just bc I played an amazing game like I didn’t get any mistakes or anything and they accused me of cheating. I feel sorry for people who rlly don’t know how to lose, I would never cheat. What is the point?
Yes I looked at his other games. He clearly cheats you can see the moment he starts cheating and plays 15 best moves in a row to completely turn the game around. As I said he is a 500 blitz but 1200 rapid that’s a clear sign there. I have gotten these messages before from chess.com reimbursing me elo for playing with cheaters but this account hasn’t been banned and as I said before he even admitted to cheating! No I did not take a screenshot but I still check his games every now and then and can clearly tell he cheats

It's a toy, not an over the board tournament. If they steal 8 points from everyone who cares. When their rating gets high enough, they'll get caught and they'll be back as someone else!? I play 3/2 almost everyday. The openings I play are thought provoking. If I suspect my opponent of cheating, I block them and move on. Cheaters here are in my opinion, "Under Control". This particular on just happen to get on your nerves. I watched 1 blatant cheater finish with 2:48 in a 3/2 after 40 moves. The points you lost wouldn't cause a rating adjustment of any of the people you played. You have the power to ban, it's just 1 at a time. lol

Your description of this person's games does not sound like cheating. If a person makes an erroneous move and does not lose, that is not simply because they played better later in the game. It is because their opponent also made an erroneous move. As Tartakower put it, "The winner of the game is the person who makes the next-to-last mistake."

I've had the occasional encounter with cheaters: I played a bullet game once where my opponent found a difficult checkmate with a pawn. I honestly didn't suspect him of cheating (I've found pawn checkmates of my own as recently as last week!), but he did get banned (I looked at his games; it was the right call) and I got my points back. In another situation, I was playing in a daily tournament where one of the players in my group won 7 out of 8 games, 6 of them with around 95% accuracy. The only one he lost was because he withdrew from the tournament. He still hasn't been banned to this day, although he hasn't played any games since.

alfonsomateoruiz. He hasn’t played since that round of the tournament but I was more frustrated then than I am now.

Guys what the hell? I just looked at the account all he plays is daily chess. It’s not even that impressive to play well in daily😂
This is off topic but I’ve had some people accuse me of cheating just bc I played an amazing game like I didn’t get any mistakes or anything and they accused me of cheating. I feel sorry for people who rlly don’t know how to lose, I would never cheat. What is the point?
Earlier, before I had played a lot of blitz, I was 1900 rapid, but underrated with 1200 in blitz. Partly because i didn't play much blitz, and because I played casually. So one game I was just chilling, and i ended up being a knight down against a 1300 in a rook endgame. I started playing seriously, put both my rooks on the second rank, marched my king front and and then I checkmated him. Another time I beat a 2000+ in blitz, and they both accused me of cheating., though i was playing clean. Im also 1200 in daily, and once a 1500 that i demolished in 2 consecutive games accused me of sandbagging saying I can't bear to lose to people of my own strength.
I've came across a problem running into a very obvious cheater. I won't publicly put their chess.com account name here but he played horribly in the opening and then out of nowhere he started playing amazingly and with a deep understanding of the game. he ended up beating me as around a 1200 rapid at the time and I checked his account. first of all he was a 500 rated blitz and played a decent amount of blitz losing to 4 and 500's. I checked his recent games and could clearly see the moment he would start cheating in his games and play all the best moves and come back from a hopeless position. I reported him multiple times and this was well over a month ago and nothing has happened and he is still playing more games cheating and taking elo from other people so it is less about me now and more about everyone!
Just wondering if their is anything else I can do? email someone this account and the games and all? people are unfairly losing rating points to the mentioned i ran into.
Im not delusional either he admitted to cheating in the chat with me in the game!!