contract cancellation

I app**** for a router and 4 gig data contrat with CellC. At sales stage I was not told the routers are out of stock.Upon delivery I only received the sim cards.I called CellC Customer Care and I was told Routers are out of stock. I wrote a complaint on their Facebook page and I was contacted, I requested a cancellation.<br> <br> The cancellation was done according to me since I was given a case number of ***.On the 20th/02/2015 I was debited R620.00 from CellC. I did a reversal and I was charged R20.00 for that. Upon cancellation I was informed that since I never used the data and the run date was not sent to the bank I was not going to be charged. <br> <br> On the 20th of this month I was debited R620.00 again and I fail to understand what am I being charged for. A reversal was done for this debit order and I again charged R20.00. CellC stop debiting my account.