Bad service

Well I'm getting really frustrated with cell c service,I have been with the network for more than 5 years but the service I have been getting is unacceptable,yes I admit that I couldn't pay my contract for 4 months course I was on maternity leave but when I got back to work I made sure that I paid the R8400 in full which was paid in January this year but now cell c can't clear my name under blacklisted people this is affecting my credit score,I sent them a paid up letter then I was told to wait for 2 months now it's 8 months later but still nothing...last month I miss placed my simcard when I went to my nearest store I was told about an affidavit what in the good Lord is that suppose to help me?I call the service center but it's still the same nonsense over and over again, I'm really getting tired of this.no wander they busy losing customers cause of does unprofessional people working for them...I want this matter to be sorted out or I'll be going the legal route cause I'm getting tired and it's frustrating having to deal with this nonsense