Unhappy client. Canceling contract without permission.

I've been with cell c for almost 10 years. I've sent 2 emails 2 weeks before end of August for cell c not to cancell my contract. End of Aug my contract was canceled against my will. I'm not happy. Now it's difficult to open another account. I'm working abroad and my daughter is using the router back home. I'm really really not happy. Cell C should reinstate my account without any issues. Hence they're sending me an sms telling me that I do not meet the criteria to open an account. They didn't even received my pay slip and bankstatements to say that. Cell C can see that I've been a good payer this 10 years.

How can they do that. They've caused a lot of inconvenience.