Why is my account being debited?

I cancelled the contract 4 or 5 months back, I even went to Menlyn store to enquire about the clarity on why my account is still being debited. I was asked if I had written a letter - which I had and they told me to fill in some form which I did. On the 12th of January I received an sms saying that they received a notice to cancel my contract. But they have been taking my money since then. My request: refund my money into my account and why is telkom still busy taking money from my account?