Takealot rejected my return because I didn't return thier email in 5 hours.

I purchased a Mecer laptop and took delivery on the 13th of August. On the 14th when we tried to get going it moved from rebooting to repairing itself then back to rebooting, it did this for hours. Naturally I logged a call and returned it on the 14th. On the 17th Wisani.M sends an email for the pin at 11am. On the 18th at 8am s/he rejected my return becasuse I didn't respond to the e-mail. It was literally 5 working hours between the email and rejecting my return. Takealot didn't even attempt to call me, nothing. 1 email and 5 working hours later, sorry your money is gone down the drain. What does Wisani and Take-a-lot expect me to do with a laptop that won't switch on? Even Takealot's turn-around time isn't 5 working hours. Basically thier guarantees are lies.