Creating a new account to ask why was your old account banned may only cause more problems for you. Looks like your last post was only 20min or so before starting this topic and it was a bump.
How many PM's did you send in 14 days and could these PM's be seen as spam by some members?
Edit:
I am fairly confident that it was because you were wearing a paid signature and were making insubstantial posts. Looking at the last 3 pages of your post history I see that you have made pretty much nothing more then one liners and slightly longer, but still insubstantial posts.
You can try to appeal your ban to get it to expire early, however you will need to give a good reason why this should happen. I personally have not seen anyone ever post/give a good reason why their ban should expire early.
I didn't think you would receive a bitcointalk ban for spamming with a sig, maybe get kicked out of your campaign but not from the forum.