Hi Sazza,
I'm so sorry to hear that this has happened to you, I know how badly such things can affect a person. It can be surprisingly upsetting, particularly when you know you were not in the wrong.
I did wonder if perhaps that person "x'd" you, which may then have caused your chat posts to be removed whilst a member of staff checked back on the past chat to see what was happening. Might be worth a quick try now just to see if you're in again.
I won't say "don't take it to heart" because, having been in a similar situation myself (something I said on chat was repeated but misquoted on here, and unfortunately a few members jumped on me without knowing the full facts, nor even having seen the chat themselves). It is upsetting and impossible not to take personally, but I would be very surprised if you have been banned without warning. If you do a tester and get in, even if you don't want to chat, it may make you feel a bit better.
Although I never forgot (obviously), I did get over it, and hope you will too (no more knotted stomach and racing heartbeat).
All the best.
Argey x