Retroucious services from Sonia Cashier manager at Game Key West

Went to Game Keywest yesterday and bought their Simba chips and a couple of other things. I got home to discover that I was overcharged on 1 packet.. Imagine 1 packet of chips for R45? Anyway... I contacted the store to speak to the manager, I was transfered to the cashiers manager by the name of Sonia. We went through the slip and Sonia agreed that I was overcharged... She told me how they told them that there was a problem with their codes. I then asked her how do we sort this out. She was very arrogant and went on about how it's not her fault! How it is my problem! How she can't keep track of all the prices of all items in the shop. Mind you I wasn't even putting a blame on anyone, I understand errors happen sometimes but her response to me was very rude and arrogant. I told Sonia that I live in Fourways so should I drive +- 45 kms to fetch the difference? She told me even if I come next year... It's not her problem it's my problem...It's Games fault and not hers. I went on to tell her that as a manager she represents Game and therefore should take responsibility and figure out how to resolve the matter. I was very shocked how a manager can handle a customer service issue in such an irresponsible manner... To my knowledge one of the functions of management is to deal with customer complaints and expectations... Im not sure what Sonia deals with. I then told her that I will report her to the head office she went on to say I must go ahead.....imagen! I contacted the head office and spoke to Ishmael and explained everything to... He went round and round in circles so much that I had to ask him how will this be resolved. How will I be compensated as a customer?He went on to say how the store will contact me in the morning... There was absolutely no urgency regarding the matter. I am appauled by Game and it's employees.!!!