Overcharged for products and company is refusing to give refund after admitting that i was overcharged

On the 19th of November 2023 i sent a friend of mine to Porto's Fish and Chip's Volkskrust to buy 5 packs of cheese Russians. Was charged an amount of R1235,55 for 5 packs of Russians which was double the price, I have called the store on numerous occasions to try and rectify the matter. The store manager Barend admitted that I was overcharged and promised to sort it out. Initially he requested that I send someone, and he will give them the refund. During December 2023 I sent a family member to collect refund and was told by Barend that I should submit banking details and he will transfer the difference to my account. Nothing has transpired since with Barend promising to refund R50 per pack which was way below the price of my refund. I have been struggling ever since to get my refund. I then started dealing with another manager by the name of Johan who also made promises and to date no payment was received. The last promise was that the transfer will be done on Sunday the 7th of January 2023.To date no refund was received. I have sent numerous what's app to the company and they keep on making false promises. Porto's Volkskrust is robbing innocent South Africans who do not check prices and are overcharged by these people. Please be careful as Porto's Volkskrust is ****ming people. Be careful!!!!!!!