Refusal To Cancel Membership

In December while I was on holiday in Durban with my family, I was invited into an Easy Holidays presentation and was sold membership of which I liked at the time. I signed up and paid R1500 deposit, upon coming back from holiday we conducted our own research about the holiday club and we're not happy with what we found. We then decided to call and terminate/cancel our membership. The agent we spoke to said it was not possible to be refunded the deposit money but she will cancel membership. In January no debit orders were attempted by Easy Holidays and I was convinced my member was terminated. On the 25th February I received from one of their agents by the name of Manzimtoti who tried to sell me a cheaper membership I told him to call the following day as I had to discuss with my wife. He never called back, to my surprise an amount of R 3100 has been deducted from my account. When I call to inquire I'm told to write an email stating my reasons to cancel, but I have already canceled. I don't want this membership and I'm worried it might spoil my credit record.