************ foreign exchange charges - and ignored by FNB

I booked and paid for a car from Europcar Norway on my (FNB run) Discovery Card. On returning home I saw I had been incorrectly charged. Europcar agreed and then did two things - they credited me the full charge passed on my card and re-charged the lesser amount on the same date. The transactions were all done in Norwegian Krone. On looking at the ZAR amounts, I noticed something wrong. It turns out the exchange rate of the credit and the charge (on the same date) varied by approximately 7.5%, a cost of approximately R1,000. I have been disputing this with FNB since late October 2019 and have made ZERO progress - they keep blaming Europcar, even though I have sent them the Europcar invoices. The only time they interact with me is when I call them! Hopefully someone senior from FNB (Discovery Card) will read this and respond, because I ain't going away!