Terrible service and poorly trained online consultants Reversal pending

I was refused goods at a store on the 21st Oct after trying 3 times on my C card for R805 Eventually I paid cash as the transaction had failed due to poor network or whatver other pathetic excuse ....To my surprise the money was gone of my account pending and fnb or the merchant refuse to sort the problem out Why should this be my problem and why am I paying 2 times for 1 Item REALLY PATHETIC SERVICE