Telkom refuses to replace new matebook that doesn't switch on

Bought a Huawei D15 Matebook on the 10th of August 2021 from Telkom in Mall of Africa.

The matebook does not switch on since yesterday, (19 August 2021).

Took it back to Telkom at Mall of Africa and they refused to replace it saying 7days has passed.

I cannot pay a 36 months contract for a matebook that doesn't work Instead they gave the case number: ***7