CELL C Legal

I have tried to contact your legal department for 2 weeks with no luck. The lines are always down and the calls are dropped. This is an urgent matter and your consultants are ***********. I had an account with you 4 years ago which I have paid up but it is still showing as a negative amount on my credit check which is affecting my credit record. The consultant I dealt with when I paid up the account told me that the account would be closed once the payments were made. I don't understand why the account is still open and why I was not informed of the outstanding amount. Please advise on how to resolve this matter.