Checkers App Sixty60

I purchased some items on the Checkers App (Sixty60) on 13 January 2023 for R417.96 but they did have stock on one items so the official amount was R262.97 so therefore R154.99 needs to be refunded back to my account which according to them will take 3 days but still till date I did not receive my refund. On 18 January 2023 I used the Checkers App (Sixty60) and the total amount was R149.98 but again one item was out of stock therefore my actual amount was R84.99 so R64.99 should be refunded back to me and again nothing. I have sent an email to *** but no response. I do not understand why I must chase for my money back. This is day light *******!!!!!!!!!!!!! The items on the App is not updated as well so before checking out you have to select other alternative which again takes times. But if you don't select another alternative you will be stuck in the same situation as me.