Support are normally pretty good with billing issues: how long ago did you contact them? And was that using the page at https://support.chess.com/customer/portal/emails/new?
Chess.com Customer Support Awful!

Hello Fatalpixels. I have now refunded and canceled your membership as you have asked for. Sorry for the delay in the resolution of this matter. Have a nice day! :)

I am currently experiences a similar issue, i enjoy this site and it's services but you charged my account nearly a month after my experiation and i do not want the renewal to happen at this time, I have sent 3 or 4 messages over the last 4 days. I am looking to be refunded and will in the future renew a membership when it becomes a more appropriate time based on my finances
Hi, this is now my 5th time attempting to get help!
First attempted to fix my issues with a message with support. No one ever got back to me.
Now trying here. I signed up for the trial period and later decided not to do it. Was still charged and now no way to get a refund or getting ANY help from your support.
I want you guys to fix this now.