Harassment from Nimble for an MBD account

As usual the service is pathetic. I have previously posted that my MTN account is with MBD and not Nimble and was asked to send proof from MBD which I have sent to *** on the 4th October. Yet the harassment continues, even my credit bureau has MBD not Nimble. The consultants still cannot provide reasons why they are calling me, one of them told me that after I pay the instalment to MBD, they pay it to Nimble. I do not appreciate the continuous harassment and bad attitude from the consultants that don't want to listen but talk over me. Please remove my account from your database.