Woolies Online confirms online order collection - and after waiting 2 hours being informed there's no stock

I placed my first online order for collection at Town Square. On arrival at the store, I went inside as I wasn't sure of the process. I was asked for my order number and to show the employee where my car is parked and advised they will get my order and bring it to the car. This was at 12h45. I selected the 12h00-13h00 collection timeslot. 1 hour and 15 minutes later I was still waiting. I went into store to enquire and was told they will check. 1 hour and 30 minutes I called customer service and they advised I will be contacted by the store. I eventually left. TWO hours later I received a call from the store telling me they do not have stock. Why send me an SMS informing me my order is ready for collection if you do not have stock. I wasted 2 hours and missed 2 meetings while waiting. This is terrible service, especially for my first experience