checkers decline system for purchases

so yesterday on the 30th of June i went to checkers in woodlands mall in pretoria east. I purchased some items,then as i paid with my card i was told the card declined but it had gone through on my side. so i asked for the slip in case it does a duplication. they told me the is no proof its a decline if it doesnt print out a receipt. imagine if i had no other money. i was then told if i swipe again the money that went through will reverse or alternatively the next day it will reverse and that i will get a call from them in the morning. they even told me that its my capitec bank and that a guaranteed 99.9 that a reversal will happen. now the money i had to duplicate i was meant to use it for other things. i couldnt go out without the items so i had to pay double for my items. The is still no reversal and no call from them. its the 1st and debit orders are going out and still nothing from them. whats worse unlike other places where you get a receipt of dicline,i got nothing on their side. so i want to know is this how checkers in woodlands traet their customers or just black people they think will not write anything or make a complaint in right channels