Not refunding product with defect. Pathetic Service!

I've ordered the SteelSeries Arctis 7X+ Lossless Wireless Multi-Platform Gaming Headset from Takealot but on arrival I found that it had a fault. It was stuttering when playing videos or when using when gaming. I Googled it and saw that it was a known issue with the headset and that there was a long list of thing to troubleshoot. I went through the list and found that none of the items of the list helped me. Now this is a R2700 headset and I am not going to joke around with that kind of money so I sent it back. So here comes Mr Shopping assistant telling me there is nothing wrong with the headset and I have to take it back. He could not have possibly have tested the headset! He received the package at 10:10 and evaluated the package at 10:13 on the system. Tells me that assistant is literally just sitting there sending out template emails and refusing refunds. Trying to get hold of a Manager there is another thing... no one responds to you.