Cell C is useless

A ********** account was opened with Cell C on my name. Since Feb 24 2016 I have contacted Cell C to find out how to report the case. I have sent in all the required documentation to their ***** department as require. Since then I had 6 - 8 call from their credit department requesting me to settle the account. Each time I try to phone the ***** department I'm put on hold or don't even get through to the department. This shows you how bad the service is from Cell C. All I want is to get this sorted out and clear my credit record. What do I do next ??