Crunch Fitness Obnoxious collections and phone harassment, Internet

Signed up with a Crunch Fitness in San Francisco.  At the time I signed up I informed the membership rep that my company was moving offices at the end of the year so I only needed a Membership through December.  They said no problem. I paid the entire membership in advance and at the end of the year moved on without thinking about it.  A couple months later I started getting harassing collections calls from them.

I informed them of the situation and asked them to cancel my membership.  They said I had to come in and fill out forms to do it and claimed they I owed them fees for the months that had passed since I moved. I told them they were mistaken, that I had moved away and was unavailable to "Fill out their forms" and asked them to stop calling me. Since then they have had a beligerent collections person call me at work everyday.