Anybody who's got development knowledge correct me here please if I am wrong. Apparently you got banned because Anti-Cheat caught your GTA:SA client having corrupted DLL files. (According to MTA wiki's Anti-Cheat guide, VF #2 isn't listed as a display code anywhere (AC #2 is the closest to your case), but assuming you mentioned that you changed out your GTA:SA client it's most likely that it has missing/corrupted DLL files that's triggering Anti-Cheat).
I can't give you a clear solution to the problem, I myself don't use a pirated copy of GTA:SA. I recommend you get a clean copy from somewhere that's not corrupted to hell.