MTN PATHETIC

MTN owe me money and they are giving false information on my payment record to credit score as they say i am in arrears for x2 months now instead of them owing me!!!!! Why can they just do it and now I need to write e-mails/letter/sms/phone!!!! I pay my bills every month and is very conscious of my credit score and they come and F..... it up and I am losing points due to their negligence!!!!! They promise every time to sort it, but to date nothing!!!!!!Who gives them the right to do that!!!!! Why do I as the person thats not at fault be penalised for MTN's incompetence?????? They just don't care!! PATHETIC!!!!