Error on pricing

In the HiFi corporation special booklet was a Samsing A16 for R2799, Went to the Greenacres HiFi in PE, Upon entering the store, Saw the special brochure again, When getting to the counter wanting to pay, the phone was R3999, Downloaded something and price went down to R3799, When asking why its this price, They said there wasa error in the book, waiting so long and they went up and down, they brought a printed page, Stating there was a error, My question is why isnt this page where the special brochures is lying? AS THIS was a Christmas gift, the phone was bought, for R3299 as they gave off another R500, But i am not happy at all with this, When you go to other stores, The error pages are sticked up where the special brochures is, I would never support HiFi again due to this.