CELLC KEEP ON DEBITING MY ACCOUNT DESPITE CANCELLA

I complained about CellC on this forum in June 2015 about the battle to access its network within a day after taking its 2g data contract. They sent their technician to my house soon after that and she confirmed that there is no network. The same afternoon I was phoned by their employee by the name of Patrick Mputi who advised that I return the modem, sim card and all other things I was given to the store ie CellC Festival Mall and gave me Ref no *** and SD no 395338 that I had to also give the store so they can effect cancellation without any penalty. I duly comp****. But surprisingly at the end of June 2015 amount totalling R195.00 was debited from my account. I reversed this transaction at my bank and obviously at a cost which was painful to me. Now at the end of July 2015 they have debited again the amount of R293.99 from my account. Every time when I called their customer car I m just being sent from pillar to post. I don't know what else to do and I cant close my bank account to stop their debits.