Horrific Service from Fairprice and FNB

We purchased a stove , oven and extractor for R8100 in store at the Southgate Branch , we swiped , the device said approved , fair price now says the purchase is not showing on their system and it has been deducted from my balance and is sitting in movements due. My bank cannot reverse as it is in movement due. Fairprice and FNB is now saying they cannot do anything , surely FNB should say what entries went through as it was a FNB swiping facility , Fairprice has not communicated anything it has been 5 days I still have not received any goods or a refund , I don’t need the goods anymore but I need the money back into my account. This needs to be sorted and the issue is between fair price and FNB and it is their duty to sort it out , I am a customer I should not be the one running around all I need is my money to be put back into my account.