Extremely Poor Service

After having my account that was handed over to a different law firm and receiving a a paid up letter, I was happy that I was finally free from those payments. My joy was short lived as I started getting calls from MBD inc to make payment for the same account... I sent through a the numerous emails with the paid up letter for the account in question but this didn't help at all... I made numerous calls and promised that this would be resolved. I then found that this had been updated on my ITC credit profile by MBD and showed as being in arrears, thus having a negative impact on my credit score... I have tried all I can to get this resolved until today after almost 4 to 5 months of seeking help, I finally spoke to a gentleman called Sandile Mtshali who is the first person to sound promising with regards to helping me. He has promised that this ill be resolved in 7 to 14 days. I truly hope that it can be resolved as it has been a nightmare dealing with them