STANDARD BANK MUST PAY BACK THE MONEY!

I went to Pick n pay Norwood on 2nd December 2017 and purchased goods worth R879.61 and the card declined as they said the machine was offline. However, the money was deducted from my Standard bank account. I have been on numerous occasions to the bank and to pick n pay for the money to be refunded into my account but I still have not been assisted. When I go to the bank they send me to Pick n pay and Pick n pay refers me back to the bank as "the transaction never went through". I was asked by the bank to complete a charge dispute form and I was later told that its only for transactions that went through, Funny enough the money left my account and I got notification for that. I have also tried resolving this by calling the bank everyday and I still do not have a clear explanation as to what happened to my money and when I will get it back. At this point, I just want my money to be refunded before I take this to the ombudsman.