Look, you got banned, the ban is on our banlist, and Grmbl just says "bye". To me it seems that you may have cheated, and you realized you wouldn't be unbanned, thats why you decided to quit CS.
This whole situation is really dodgy, as you suddenly get banned, your last chance, you don't even bother appealing it, and you quit straight away. This to me means that you may have cheated, and now you want to play again, but you aren't telling us the whole truth.