Steeling my money

I bought goods via instant eft on 7 December 2018 from the Mr Price app. and received my confirmation email. A week later I contacted the call centre to find out why my goods were not yet delivered and I was informed the reference number is invalid and that the order does not exist even though my vank statement shows payment was done. On the 14th of December more correspondence via email (my request no 444120) and had to provide proof of payment, which I sent on 18 December. Since then nobody is responding to my request and I am R800 out of pocket and cant show anything for it. This is the worst customer service I’ve received!!!