If you had a perm ban, then you are perm banned.
If the ban was temp, then it would have been lifted.
If the ban was a genuine mistake, why did you wait 5 months (as you claim) before questioning it? After all, you say you say you 'really like the server' yet havent tried to log on for 5 months ...
If the ban was justified then I do not believe for one minute that you don't know why you were banned in the first place - sounds like a case of 'you made your bed, now lie in it'
tbh something about your story just doesnt ring true ...