FNB allows ********** double transactions!

I made a transaction at The willow tree pub and grill on the 25th June around 19:00, the transaction was successful the first time and wasn't swiped again. To my surprise on the 29th I received 2 transactions from The Willow tree dated the 25th and the 26th. I contacted them and I was not successful. I was told it went once and that they didn't receive any extra amount on their books.

I then escalated this matter with FNB hoping they will resolve this case but this was their response. "1/3 FNB :-) We regret to inform you that we are not in a position to handle this dispute with the merchant on your behalf. The Chip on the card together with"

Truly disappointing customer service from FNB when I clearly stated I swiped one transaction successfully and was double charged. As my bank have failed to deliver me a service that ensures the safety of my transactions.

The least FNB could have done was to ask prove from the merchant to prove that the transaction was indeed done twice, if the merchant fails to provide this which they will then I must get my refund.