ACCOUNT BEING DEBITED FOR DEVICE THAT I DONT HAVE

I took out this contract in June but was unhappy with it. I than cancelled within my cool off period. Vodacom only collected the device 2 weeks later after continuous follow up from my side. They had assured me that the contract has been cancelled. However my bank account was still being debited for the device. I called customer care and they said that they would reverse all the charges and refund me whatever was due. To date they have not done so and my bank account is still being debited for something that I don't have..<br> Please sort this out and refund me all my money!!!!<br>