Very disappointed in wrong advertising

I am very disappointed in wrong advertising of Nola Mayonnaise at Pick 'n Pay Vaal Mall. Currently there is a limited edition 850g bottles of Nola Mayonnaise in stores. On the bottle it is VERY LARGE in yellow and black written that you get 100g free. The original bottle size is 750g. Therefore you would say that these 850g bottles should cost the same as the normal 750g bottles. To my surprise I saw that the 750g bottles cost R27,99 and the 850g bottles cost R36,99.

This means you pay 32% more and you only get 13% more mayonnaise - WHICH SHOULD ANYWAY BE FREE ACCORDING TO THE PACKAGING

THIS MAKES ME SO MAD..... I took a picture of it as well should you not believe me. I see these type of things regularly thats why I decided to act on this specific one. I am seriously considering shifting over to Checkers for all my grocery shopping. I see these type of things much less with them.