Disappointed with the service at Pick n Pay Durban North online department

I purchased a Hisense TV on Pick n Pay online shopping site on Black Friday, 23/11/18 at around 10am. We used the click and collect and the earliest available date was the 7th December. Our credit card was verified at the checkout as well. We received a sms on the 6th stating that we can fetch our order on the 7th between 11-12pm. The purchase amount was also reserved from our credit card. My husband was running late so I called the store to check if we can pick up at a later time. It was only then, that I was informed that there was no stock of the TV and my order was cancelled and they will never be getting stock of this TV again. I asked to speak to a manager and a lady by the name of Mona came to the phone. She explained the same and advised that online shoppers don't get 1st preference to specials and that only walk in customers get preference to available stock. Why did Pick N Pay put up the specials on the site if this was the case. I explained that all products that were out of stock were greyed out and this TV was not greyed out. Furthermore, the same TV was on special on the 26/11/18 and a friend of ours purchased it which means they had stock on the Friday when I purchased it. I purchased from other stores online on black Friday and received my products with no hassle. My husband went to the store to check why this was the case and spoke to Mona who gave him the same story. She also showed him a list of people who were turned away due to no stock. We are regular shoppers at the Pick N Pay and are very disappointed. We would appreciate if someone at a higher management level could contact us to rectify this as we want this TV as advertised on Black Friday.