Double Debit off Bank Account - *****ING form Clients

PEP 8673 I'm disgusted at how Pep store take things light. I visited the store on 6 October 2017 where my transaction for my DSTV was declined TWICE, I did not understand why as I knew I have funds on the account, the cashier told me that their POS Machine usually does that to FNB Accounts, and the money went off my bank account!!! There is no sign in the shop that advises client of SUCH inconvenience.!!!! I was then told there is nothing they can do from their side as the Financial Department was closed, and I have to come back Monday morning. I then phoned PEP, only to be told that I cannot be assisted on that day as the transaction must first go off my account, SUCH INCONVENIENCE, AGAIN!!!!! When I phoned my bank the Monday morning 09/10/2017 to asked what I can do, they advised me to logged a query at the bank - which I did, they will then from their side logged a query with Pep - which they did BUT NO ONE AT PEP GETS BACK TO THE BANK!! This is THE LAST TIME PEP WILL EVER SEE ME!!