****** off my money

My car windreen was broken, reported the issue at NFC. The replacement of the windscreen cost me R6300. They told me I need to pay R2000 access fee or get the car fixed and send them the slip so they can reimburse me the R4300. I did just that. When it was time for them to pay me what was owed to me, I was asked how I made a payment. Explained to them that I used my fleet card and they demanded a slip from the swiping machine. Told them I didn't have it as the merchant called Absa fleet for authorization and when 8 was authorized there was no need to swipe my fleet card. And I was told that they unfortunately they won't give me back my money because I didn't have the slip and yet the invoice from the merchant was given to them. Help me get my money back from those ********