Extra debit after cancellation

I went to Planet Fitness Aurora to cancel my wife's and my membership. The said I have to do cancellations through their head office and gave me a business card with the \Help"line number and an e-mail address. I attempted to phone the \""Help\"" line and it just rings endlessly. I eventually sent an e-mail (and got no response back acknowledging receipt). About 2 months later I got a call saying I owed them 2 months fees"