Where has my payment disappeared to?

On the 6th September 2017 i made a debit card payment of R800 at the Jet Mart store on West Street in Durban. Payment is not reflecting on my account statement, after investigation the store was offline. To date my account has still not been rectified! I have been sending emails like a lunatic week on week to the store, your customer experience and the only response i keep getting from a "Susan" is that my query has been escalated, then it needs to be verified by my bank and it goes on and on... I have sent proof of my bank statement but still it is so difficult for my account to sorted out. I don't understand from the 6th of September to the 30th October...what is going on? How difficult can this be? And the service including the mundane feedback is absolutely pathetic. This is not a riddle that you need to figure out, I made a payment of R800, your store was offline, you have my proof of payment, rectify my account or give me my money back...easy peasy...