Bad service when I have to get my money reversed

On Friday(02 Mar2018) I went ot purchase at pep store in Alberton City. I used my FNB card to pay for my purchase. It declined 2 time and as I was on my way to withdraw cash I got notifications that the same transactions were successful.My issue is that now I am being sent from pillar to post just to get my refund, Pep people(Juby) is telling me that it is not their fault it is the bank's fault cause them(PEP)did not even receive the moneyand I have to wait for 10 days for the reversal. And the bank is telling me that I have to go to PEP. To me I do not care whose fault it is I just want my money back and I want it from Pep, because that is where I swiped my card. I am not happy with the fact that I have to wait for so long to get my refund. I am sure I should not be caught in the "It is not our Fault" nonsense to get what is mine.