Frequent incorrect pricing.

I would like to encourage people to check their till slips when buying from Checkers and Checkers Hyper as I experienced numerous instances where the shelf price and the price on the till slip differ in favour of Checkers. The latest instance was the shelf price of Lucky Star Tuna where the shelf price was R26 for two and I was charged R18.99. This was 25 May 2020. They also went to check and told me I am mistaken. I took the lady to show her and only then they acknowledge the mistake, As said this happen frequently. Once I complained to the manager, who told me his till price is correct. I had to point out to him that we the customers can only see the shelf price. I would like to know how many customers just pay and do not check their slips. They are making a bundle this way. It is also very interesting that all prices increase with lockdown.