Bally's Stinks

2 months after we sent a letter explaining our situation, Bally's finally got around to reading it. They once again informed us that "No one would believe us." This time, they also threatened us with collection if we didn't pay up. I realized from looking at the info they sent us, that they are actually trying to collect the full cost of a three year membership (which they allege we signed up for) even though we already paid 1.5 years of dues before we cancelled.