still no assistance

I don’t know where to turn to at this point now as I am not getting any help from the MFC complains department . Last year February 2017 my D/O came back unpaid due to financial constrains then I was called by them and made an arrangement to pay that instalment over Two months which I did ,now they say I still owe them ,I refuse to pay an amount that I know very well I’ve paid . I took them to hello peter but still they just send me a statement from the time I opened by account ,then I get phone calls of rude people like Lizette demanding money and making threats that they will take my car . I have been communicating with Louis Masilo which was no help ,I send her my bank statements and she never bothered to say anything except sending a mere statement . I have no idea where to turn too cause I feel I am being mistreated by them and the employees Please assist me as I have nowhere else to go .