Checkers changing prices as they see fit

I places an order for a soda stream machine on 60/60 when I wanted to pay through my bank app saw that my total is R500 more than what was originally advertised for when returningto my 60/60 app my total was still R500 less. The soda stream machine was on 60/60 for R500 when trying agian the soda stream machine was a R1000. I co tasted the call centrethey say they are aware that the product was wrongly advertised and they don't need to sell me the product at the original price cause they are allowed to make mistakes.

I was already paying for this product when they changed the price. It's ridiculous....