Taken money off my account wrongly and no responses.

On the 21st of Dec, I swiped my card once at Remex, for R 1200.00. The owners card machine print outs confirm one transaction. FNB took this transaction off my account 3 times. I sent in the dispute forms on the 24th of Dec, to date no response. I resent the forms on the 7th of Jan, no response. I sent a complaint to Premier banking 7th Jan, no response. I sent a complaint to customer care 7th Jan, one response to state they are investigating and will advise. I requested feedback 8th Jan as this is not complicated and they have all the documents, surely it cannot take 2 weeks and no response. No response. To date no answers from FNB but they have taken my money wrongly. I am fed up. Sort this out immediately. And I am sure that I will be looking to move my account seeing as they do not care.