I personally believe the ban should be shortened, however I'd like to poinr out that we take recent punishments into account when punishing any user, especially in the case of a ban. If you have no recent punishments you will not be banned, if you have a lot of recent punishments (such as your 13) you will be banned for some time. Punishments stay recent up to two weeks.
However a four week ban seems rather harsh - if you haven't been banned before the ban should only have been a week, maybe a few days more at most.
BBCode