Charged for items not in stock

I ordered items via the MrD app. Order was delivered from the local Pick n Pay in Victoria Rd Grassy Park. The item which cost the most was not available yet I was still charged for it. I was initially told that I would be refunded, then my Mr.D acc was credited with the amount, which I wasnt interested in, Then, only to find out that I will only be refunded in 5 days. My reason for the order was to get supper for.me.and.my children. If you don't have stock, don't charge.