Vodacom overcharged Cellphone deals

Can you please explain to me the following:

This weekend I visited a Vodacom store in Loch Logan Waterfront in Bloemfontein. When arriving at the store I informed the shop assistant that I was looking for a Samsung A25 for one of my employees. After checking availability the employee confirmed that they do have in stock. After waiting for a while a lady (whom) I believe was the manager approached me and offered to assit me with my perchase since I was doing a cash sale and not a contract. After a while of waiting the lady explained to me that she was having trouble locating the cash deal code on their server. I showed the price to the lady various times in the booklet I was handed. After almost a hour and after the lady spoke to the owner I was given a price. Needles to say that this was not the price in the booklet. Later that same day after doing some price comparison it became evident that I paid more than R2000 more for my device than I was supposed to have. Thank you Vodacom