Not allowed in the forums.
Cheating

Just report them for cheating and block them, and move on. They will know if they cheated you don't need to specify the reason, it's useless

How to report someone on chess.com https://support.chess.com/article/209-how-do-i-report-someone https://www.chess.com/forum/view/general/how-to-contact-support-1
It is against chess.com tos to discuss cheating in the public forums, so please keep all discussions around cheating in this club where it is allowed https://www.chess.com/club/cheating-forum
When a player reports a player for cheating we should be able to say why we think they cheated.