FNB

I have serious problem with FNB and UBER. My husband and I have been travelling with UBER for over the past 2 weeks. Since we had car problems and getting that sorted. I want to complain that we have be double charged for our UBER trips to work. We have made several contact with FNB and UBER to check why we have been charged double. UBER advised that we need to take it up with FNB. Point is I am fed-up of having to go back forth with UBER and FNB trying to resolve this issue and nothing happens. Has anyone been in this situation before? I need help please, what is the next step how do I get my refund? Nobody seems to be doing anything!!!!!!!!!