Be prepared for anything ar Game

Good day yesterday I purchased 2 Jacobs coffees which were 2 for R110,tomorrow I was supposed to collected my order as it was ready for collection since yesterday. I has planned to collect my order on the 19th since I had plans to go to town. Now I received an email that my order has been picked up. I called the initial store where the order should be collected and they are telling me that the price was an error. But as a customer how am I supposed to know it was an error? If I bought 20 I would say now that an error that I could capitalise on. Is it my fault because that's the price I saw and that's the price I paid. If that's how they operate then when buying at game we should always be ready for anything to happen since their prices are questionable. Just refund me and I will never bother to buy from your store because clearly your customer service should be on -0.