Well, when did you send your contact support attempt? They are not available 24/7.
I assure you that they want to help you with your payment problems.
But you need to give them a little time.
Others have had the same problem in the past- https://www.chess.com/forum/view/help-support/pretty-urgent-error-2777
Hi,
I try to activate free 1-week trial with valid card and I always get error 2777. Support is not responsive.