Cell C Sucks

My contract with Cell C expires on 18th November. I went to the shop where I took out the contract two years ago so that I could terminate it. They said it was impossible and I had to phone or mail Cell C. My son uses the Cell C phone, so I have to pay for the call. I waited more than ten minutes without getting help. I mailed on 15th November and again after that. They say a consultant will phone me within 48 hours. I am still waiting. What more must I do??? This is pathetic.