Always charging wrong prices *******s !

So I went to pick n pay mall at reds who never fail to disappoint. They had the monster on special 2for 22rands. They had packs n packs of 4s I see a employee I ask her if I take the 4pack will the price be same I quote 'all monsters are on special' cool go to the till the cashier num 1 was rude n arrogant .we ask will the monsters be the special price 'yes your smart shopper will allocated your discount'low n behold I see my slip now and I was literally over charged instead of 44 for each pack of 4 I was charged 69.99. Now if u having a special don't put the signs were u have packs of 4 and teach your staff if they don't know something get information n not give incorrect info. This matter better be sorted out I want my refund frm all almost 7 or 8packs of 4s that I took and was overcharged ! Ridiculous service always looking 2rob ppl mall at reds need higher management .the cashier was NC22 that's on the slip she was also very rude 2the customers b4 us as well ! Smashed my Bread never asked how many bags n on a blk Friday weekend you shud have had more packers so I really don't blame the cashier as she had 2cash n pack however I want my price corrected or I will take this further !