South downs pick n pay never make you of them

Pick n Pay South downs should work on there policies and they made a mistake and I showed them there was a pricing mistake I made them aware of it and asked for the difference back I tried to be polite and they were not willing to pay me the difference I bought it yesterday and this morning I went back as I noticed the mistake on the pricing Vs what they charged me I said I could not return my suryp as it was already opened I 100 rand extra they charged me so to the south dons pick n pay if you lose business because of this atleast I am not suing you