No feedback and poor service over phone

I have tried to contact the company on numerous occasions, left a detailed voice message as well as emailed the address provided on the website. I tried again to contact the number today, eventually getting someone on the line, which put me through to someone else, then I was cut off. I returned the call, got put through again and the service received was terrible. I am inquiring a handed over account that was settled more than a year ago, however the credit providers system is still showing that I owe the money. I requested a letter indicating this account is settled or that the attorneys should clear this with the credit provider whereupon the response was " the file is closed and I cannot help you" I was asked for my email address which was not even listened to properly and the call was dropped, just like that. I am a client merely requesting a valid explanation and clarity on my paid up account and the fact that the credit provider still does not have the correct information? I feel that MBD should have informed their client that the account is paid in full so that they can update their records. I also had a debit order to pay this account, not once had a statement of any kind to show the status of my account, I had to personally keep record when I received calls monthly although my debit order never failed. So in short, I feel that MBD is quick to contact clients regarding payments, but when the client requests valid information it is not dealt with. I would appreciate feedback soonest.