Specials not updated on the system often a problem

We went shopping for the specials at The Sanctuary Mall yesterday. After ringing up our full trolley the employee said that the system was not reading the specials correctly and called a supervisor to correct the prices, after a while the new total was R400 more and I asked them how this is possible, it did not seem if the specials were app**** at all. I then left the till to customer service and asked if they could re scan my shopping to check. She said that the till system was wrong and re scanning would not work , they would have to re check every special on the racks where I got them. This would take hours for the R2200 shopping and I gave up. She re packed my shopping but when I got home some items were missing This is not the first time the specials are not updated and this store often remove products that are on sale, you get there are opening time and there is no stock. They are actively preventing clients from getting the special prices