Poor service at Cel C

In the end of January I have contacted Cell C via the call centre because I was due for an upgrade. I called with the intention off cancelling my contract as I personally felt I was paying to much. During this call I was offered a deal to upgrade my contract which I was happy with. I accept and waited for the first off Feburary if not mistaken for my new contract which was a data deal. When I switched on my router on the day that I was told that my router would be activated it did not work. I had to sit hours on the phone to get assistance from a consultant and was transfered from one department to another. I sent serval hours doing this. I had to borrow a friends phone because this was a router contract and only could be done via a Cel C number or I would be charged. The consultant on the phone suggested that I needed to get a new SIM card. Once doing so I had to call back as they said the SIM was a problem. This repeated three times. Eventually another consultant discovered that the deal offered to me was a home router deal. This discovery was done after several hours and several calls to Cel C. On my last call as depicted on Cel C I have clearly stated to the consultant that my contract should be cancelled. The consultant had assured me it's cancelled and to my knowledge all calls are recorded. At the end of that month I was debited the full amount. I have been to the branch near me and they advice me that all cancellation can only be done via the call centre and on there system it reflected my last call to Cel C. The next month March I was fully debited. It was difficult for me to contact Cel C as it had to be done via a Cel C number. In May I contacted Cel C for a full investigation as I had cancelled and was told all calls are recorded. Nothing has been done to date. I am still been debited for 4 months after cancellation. Cel C has offered me very poor service and I believe with me cancelling I need my refund for those months after cancellation as all calls are recorded.