Inaccurate billing on the app

I have noticed that both the orders I placed on the pick n pay app have overcharged me. The first order#***4 (11/08/2024) I paid R960.82 incl delivery fee but the items purchased cost R580.72 Order#***3 (23/07/2024) I paid R842.16 incl delivery fee for items that cost R366.21. I have never had this issue with checkers 60 sixty. Please attend to my omplaint and refund me my money.