bad service and pricing

Yesterday i went to pick n pay to buy some items . While i was busy shopping i saw some eggs pricing 42.95 then i continue with shopping , then i went to pay a cashier told me that those eggs are not 42.95 is 79.95 a cashier called a supervisor then a lady gave me a bad attitude . First of all she did not greted me or say hi then she said tome she can not discount those eggs as this is not her fault i must blame the machendizer she told me that i can even log a call or do wht ever i want to do . I was so angry bcause lilly ( cashier i eveadk her to come and c for herself . Bcauze as a customer i know my rights bcauze nca : the price i c is the price i pay for and u are not allowed to argue with a customer . And it was not for the first time i hav a problem with pricing at this store i do hav pictures for the previoys incident .