Ackermans doesn't care for their loyal customers

I opened an Ackermans account last year and I have made sure that I pay my instalments on time, every month without any hassles. Last month, I was trying to pay my account via EFT, and instead of paying R500 I accidentally paid R5000 from my mobile banking app. I immediately contacted customer care and they told me which documents I needed to send in order to get a refund. I submitted all the required documents and was told that I should expect my refund within 5-7 working days. It is now four weeks later and I still haven't received my refund. After numerous phone calls to the Ackermans call centre and hearing different stories every time, I am not happy with the service that I am receiving with regards to getting my refund. I know that if I owed Ackermans that amount, I would've already received a letter from the creditors or lawyers and getting threats to get blacklisted. But now that I am just a number to them, it doesn't matter that I need that money back to pay my other bills. I am so disappointed with Ackermans