It didnt happen to me but you can get banned without having any or little offenses on your account right. But what offenses are these, password scamming, account sharing/trading, ?

I didn't even know that you could get banned on your first offense.

probably depending on how severe account trading maybe

I think password scamming is the only thing..

Macroing, password scamming, bug abusing, real world trading, all bannable first offense.

Ok thanks that helped alot

Minor swearing will incur a small amount of black marks, whilst walking around lumby throwing a major tanty will probably result in a swift ban primarily due to the hundreds of reports against you in about 10 seconds!