If I get a ban(after the two weeks ban) because a team decided to report me because they're trolling.
This cant happen. You only get punished for things you do, and number of reports dont count against you in any way.
It takes a long time to be considered reformed by the system, and over an even longer period of time you may drop a punishment/warning tier.
Note that this is not an "allowed misbehaviors per year" system, it is a warning that you need to shape up or ship out, and you probably will be permbanned next time regardless.