Sale of defective laptop,

I purchased a laptop order no. *** return ref. MRRNN-06BD9-JQJQ. a key on the keyboard was displayed a different symbol when used. I requested a refund on my takealot account and I was not refunded. The agent Sue Ann B simply sent me an email back indicating that the same defective computer will be sent back. I require my money refunded as I'm not going to settle for a defective item. Takealot is a ****mer!