Same account billed twice

They have bought my Standard Bank account and apparently MBD also bought the same account it was a cheque account . I wanted Std Bank to close and the refused saying I owe R115 for Debit order that was returned. It went up to more than 5k and eventually Bayport settled it with MBD. Now Nimble group also expect me to pay more than 5k for the same account. They gave me a different Ref number I don't know where is coming from I am tired about this matter I feel I am being ****** how can I pay more than 10k for an account which was just R115