Planet Fitness - no service but we must pay??

I had received a communication stating the club to which i had membership would no longer be active. I advised straight away that this wouldnt suit me and didnt get a response to any mails. I had no use for the contract as they were no longer offering what i signed up for. After numerous back and forth emails and phone calls a few months later, they agreed to cancel the contract with immediate effect. The gentleman on the phone even advised my last premium would be cancelled and that i owed them nothing. Even though I had already been debited and paid for a few months of NO USE, I have now been handed over to lawyers for one months premium. This is truly unprofessional. I have already paid for MONTHS of a product/service I COULDNT USE. Surely this goes against the CPA? Planet fitness seems to just be cheating to squeeze out as much money as they can. I am truly appalled by the terrible service they have afforded me!