Online order over charged

I bought groceries on PnP online and was supposed to collect on Monday 5 October at Pnp Woodmead. On Sunday 4 October 2020 PnP debited R1087.77 from my card. When I went to collect on Tuesday 6 October 2020, I was told that they do not have stock for Babysoft tissues which i had ordered so they gave me an invoice for R864.04 saying the money for baby soft has been reversed. They said it takes 48hrs max but i still havent received the refund. order number ***6 I also got a message on 8 October saying call *** has been completed but I still dont have the funds. I guess instore shopping is the way to go as you pay for what you actually have.