Double Charged by Clicks Cashiers

22nd September 2024, I was charged an extra Item by the cashier...I called the store days later and they admitted to being at fault. When I went back to get this sorted (get a refund), no one knows anything and I must now go look for a receipt. Customer service also claims they cant find old transactions besides be providing the exact time of the transaction. Three weeks ago I was charged double again, at the same Clicks and I had to take my time and fuel to get this sorted. This looks like something cashiers do at that Clicks as there was another client querying the same thing.