Pathetic service

I have discovered that i have been paying my finance instalment with extra amount of R4000.00 since September 2022 and contacted MFC as well Nedbank Customer Care on the 28th of October 2022 which i was promised that the refund would take 48hours but no refund till to date. I have sent emails , made numerous calls but fell on deaf ears. I called again to speak to the manager first the line was cut off by Vaugan and then i received a call by a lady name Dashney but to y surprise, she asked me " HOW CAN I HELP YOU".....? i regretted for answering that call. MFC CUSTOMER SERVICE IS PATHETIC.... Mr. Neil Bausor, you are good leader with great skills but you need take your customer service teams for more training. I NEED MY REFUND.