Disappointed with lower spec product sold to me.

I purchased 2 X MSI Gaming Laptops from Game. I have the advert with me. The price was advertised as R12999. It was for the i7. However, when I got home, I opened the box and found that it was the i5. I was very disappointed. Can someone at Game please help me to get the product that was advertised and which I had gone to purchase as I find that that the i5 is misleading since the advert clearly states i7 for that price. Please respond to me urgently as I am very stressed since I feel misunderstood and helpless. I count of your sense of justice to ensure that I will get the product that I paid for. Both the products they gave me are i5's. The price advertised was for an i7 at R12999. I feel very stressed and hope that someone will treat this as urgent.