billed even months after contract was cancelled

I've been having this endless problem with planet fitness which doesn't want to refund my money. On the 4th sep 2011 I sent a cancellation email to [Email Removed] requesting that the contracts be cancelled. He requested an email which I did forward. I even called the number which appeared & spoke to Donell from head office ***. He reassured me that all would be done. But on my Nov 2013 & Dec 2013 bank statement, planet fitness was still deducting twice a month to an amount of R1480 in total. I went with all supporting docs after speaking to Desire the wellness manager at the gym, who later directed me to Sandra who's the lady based at the gyms account dept. Sandra never til today paid me saying that all the people I dealt with no longer worked for the gym. So how is that my problem? All I want is my full refund and someone should take accountability for the previous staffs mess up. I'd rather they look using my ID nbr cz those account details keep changing nbrs for each transaction they made from my then bank account. I do have supporting documents & the bank statements to date. My ID nbr is *** 088