Pick n Pay ASAP app

I have been using the Pick n Pay ASAP however the past few weeks, my order would be amended and staff will be out of stock which is a big inconvenience. If items are mot available they should not be displayed at all. Iv never had this issue could be a change in location but this is really an inconvenience and a bad customer experience. My folks are no longer interested in using the App and are discouraged due to the inconveniences.