Incorrect Information provided - now I am unable to swap a game that is faulty

I bought a PS4 Pro Console bundle which included Gran Turismo Sport at the Canal Walk store on the 21/12/2017. After a day, I decided to test it out. To my surprise, the game could not connect to the internet. I had other games such as Call of Duty and Fifa 18 and those games had no issues with connecting to the internet. I did my own research before contacting game and found that it was a server issue with Gran Turismo. I decided to call the store in Grand Central as it was the only one closest to me and asked if I could come in to have the game swapped as I was not prepared to wait on the server issue to be fixed. I explained the issue thoroughly and was stupidly asked if I had internet? I then asked if I could swap the game and was told not to bother coming in as the manufacturer had to be contacted. I told the customer service agent that the 7 days was going to be over soon and all I wanted to do was to have the game swapped for a game at the same value. I was told that this was not possible and was again advised to contact the manufacturer. I tried to get the information but failed to get hold of them. I contacted Game again, explaining the situation again only to be told that I should have come in for a refund/ swap! This is 9 days after the purchase date and I am told that it is out of their hands! I was told to not come in at all and now I am at a loss with having the game swapped. I did not spend R6000 in one go for such ****py service. I too work in a Customer Service environment and I am well aware of return/refund periods but if someone advises a customer of the incorrect information, the company takes ownership to correct the issue! Please have this looked into ASAP