I got my account suspended for a bit because some kids were giving me abuse so I replied to them and one of them must have reported me for standing up to them.
Anyway, I got my account unsuspended after about a week or so. All I did was fill out this form: https://support.twitter.com/forms/general?subtopic=suspended
(actually I kept submitting a new report every day until I was unsuspended. I don't think that's necessary though, I was just p'd off!)