Pick n pay Asap. They dont respond, rectify or refund ASAP!1000

Last Sunday i had placed an order through the pick n pay asap app. The app in itself has major issues, when the order was placed i was noyified it would be delivered between 11 and 12 that day. So i waited and by 11 it then said between 12 and 1. So I still would wait. Being sunday, most stores close at 2 o clock so when the app said my items would be delivered between 1 and 2 i could no longer wait. I had called and cancelled the order and was told that ifut comes to me i should just ask the driver to return it to the store. Which did happen just after 12(not sure of exact time). I was told upon cancellation that the refund of my money would take a "few" days. I then waited till Thursday and gave them a call again and was told an investigation had to be done and the refund will be processed immediately and was sent an email showing that they would refund me. It is now Sunday again. A whole 7 days later and i still have yet to be refunded. I again called today and was told i would have to wait 10 days from Thursday's call to receive my money. Why? When payment is made, it gets taken immediately, there's no pay in 10 days scenario but now suddenly giving a person back their money takes that long. This is a huge corporation and they seem to really not care about the way they inconvenience their customers. Tomorrow is my sons birthday and i cannot even but him a cake because pick n pay seems to see it fit ro make their customers beg for the little money thats actually owed to them on top of being inconvenienced on top of having to spend time and money now on airtime in order to beg them too. This is really too much! To my knowledge, the most time a bank transfer takes to reflect is 2 days. Where do these people get off??? This is really too much!