Bad product sold in a good store

I bought a McAfee anti-virus product from Game. The product required me to go on the internet to install it on my computer. I followed the prompts. It didn't install. I tried it gain on a different computer. Still it failed to install. I then called the them for assistance and requested a refund. But they offered me a technician to help me install the antivirus - the process took two days and without success mind you. When the Technician said we will continue into the third day. I said no. i had spend so much money on data to gain access to the internet that i requested for a refund. He patched me to the another person to talk to - this lady told me that they couldn't process a refund because I didn't have the slip to prove I purchased the product. I asked her if they can look at my account, if a technician was readily helping me a few minutes ago without requesting a slip why is it a problem now when I want my money back - she became silent for 20 min. Then came back told me she can't help me I should return to Game (in Soshanguve). So I would end up spending more money to get a refund of close to R200 for a product that has been causing me trouble ever since i bought it? Really?