Refusing to Refund

Hi. Please assist. I have suffered so much with makro online order MAK***. I placed this order on the 18 of May 2020 then on the 29 May makro cancelled my order claiming that they are out of stock, I called them several times and send emails but they didn't respond until on the 15 June they ask for my banking details so they can send my refund, I send them everything they needed then I called them the following day to ask how long it will take for them to refund me as I have been waiting for too long for my refund, they said 5 to 7 days. Today I called them only to find out nothing has been done regarding my refund of R1699 that I placed on the 18 may,