paid up letter

My account was handed over I paid it up last year and they never bothered to update the credit bureax. When I called their accounts department they told me they can't help with paid up letter, I must call their lawyers. When I called the lawyers they told me the account is with their customer friend department. I contacted them and they are sending me back to accounts enqueries. When I called they are telling me they still have to decide who's responsible for my account and I must wait at least a week for them to rrspond. I am unable to get a job because I am listed for an account that I paid Last year already