FNB Sucks

I made a purchase on the 23/05/2018 at the southgate branch, swipped debit card for the purchase and was told by the teller that my purchase was declined, which i received a notification sms of a successful purchase and the funds taken from my account, The Manager at the store insisted me to swipe my card the 2nd time, which i eventually did and was told that the funds usually reverses within a few hours, which it never did.... Today is the 07/06/2018 and i still have not received my funds, between FNB "Most Pathetic Bank" and Ackermans you guys need to sort out yourselves. How does a customer get inconvinced because of a speedpoint that's not working, and for such a huge store to have issues becomes a customer's problem, instead of ackermans calling the bank on the day and asking them to reverse the unauthorized purchased, here i am having to do a run around, having to complete a dispute form for FNB and attaching proof of purhase (Declined Receipt) which i have not received a slip from the teller, so does this now mean i should kiss my R400 Good bye??? And this is my first and last i ever go to Ackermans again!!!!FNB can kiss another valuable customer Good-bye!!!