BEING BILLED FOR CANCELLED CONTRACT

I was contacted by telesales person Mfundl Wandile Ngwane empl code 6629 in August who sold me an ADSl package which i thought was for home instead its was for a mobile.the package was uplifted &returned within 7 days & was told that the transaction was cancelled. I confirmed a week later & was told it was cancelled. I later get debited & when i called the call centre they said that this would be reversed. But the debits continued thereafter each time i had to pay the bank to reverse these debits. I contact the call centre again who assured me that this will be resolved but the debits didnt stop.. I got sms's to say that i have been handed over to Nudebt who are debt collectors & a recent SMS last week to say that i am now listed on credit bureau. I again try to contact the call centre to no avail. i go online chat to an agent who gives me a case no. was told that this matter will be escalated to the billings dept. & i will be contacted shortly. that never happened. i went to a telkom store who managed to get hold of call centre who then advises that i must get an affidavit bank statements to prove that i dont have this contract then only will this be cancelled.