Wrong Billing and Calls Daily for wrong account not with MBD

On the 22 and of February I called MDB because I was told that my account was handed to them . To my supprice MBD are saying I have 4 accounts that where handed to them like really , I called Get bucks to check why this information is wrong I was told that the account which was handed over was only one . I sent email to MBD with Proof of payment paid to Getbucks yet no one acknowledge receiving emails , they keep saying I must pay the account , MBD I have made arrangement to pay you , why cant you wait for the payment and call me again , I am tired of receiving call every time , please update my account with your call centre agents and make sure that you collect on right account after all you guys are attorneys you must know its ******* to make someone pay for the debt that is not handed to you , please update the information and tell your agents that I made arrangement if I don't pay you can call me , stop harassing me with calls daily .