Pathetic service from Pick n Pay A.S.A.P

I placed an order on a.s.a.p app and received wrong items without any notification of out of stock items. I ordered 2 1l strawberry yoghurt and received plain yoghurt. I also ordered 3 6x1l Parmalat growth +1 milk for my son but received 2 boxes and 1 normal Parmalat which is cheaper than the growth milk but yet I paid for the more expensive one. I phoned the customer service number and no answer. I phoned pick n pay Kenilworth and no answer. I email twices and logged a complaint online and only received an email a day later. Shana Smith's reply to me is you may take it back to the store with the receipt to exchange it. No apology for the inconvenience because now I have to go into the store to go exchange 3 items. No details of which store I can take it to or if I can exchange it at any store. I visited in Athlone on Sunday and used the app. So does that mean I have to drive from Blue Downs to Kenilworth to exchange yoghurt and milk? My petrol will cost more than my items. This is bad and pathetic service really