Payment dispute

On the 22 November 2017 I shopped online on the Mr Price website and received my order number: ********** 35189. I then chose the option of paying via EFT of which i paid an amount of R609.93 to them using their Absa bank details on the 24 November 2017. The payment went through on my side successfully as i even confirmed it with my bank telephonically and also received proof of payment from my bank. Now according to Mr Price they are still awaiting on my payment for the order till this day after sending them my proof of payment and making numerious number of calls to their call center. The issue here is that now my bank cant reverse that amount back because of the reasons that they gave me. I called twice today at Mr Price still no payment received, and yet they confirmed to me that the bak details ive used are correct. I need this issue to be sorted out asap, either i get my money back or my order delivered, otherwise im willing to take this matter further.