Refuse to replace defect goods

On Saturday the 17th I visited telkom store in fourways mall. I signed a 2year contract and received a huawei p10 which was sealed in the box. I opened the box when I got home and immediately inserted my sim card. I then use the phone for a short while before searching the box to see what else was in the box. I then found a cover and a screen protector. I first put the cover on and there after I put the screen protector. Whilst applying the screen guard, which requires you to apply slight pressure the screen had cracked. This for he was not normal as I have owned Nanyang such devices from telkom as well as vodacom. I then removed my sim and packed all the contents back into the box. I returned the phone to the store and the consultant insists it's my fault. He insists on this yet when handing the device over initially he had not inspected the phone.

I firmly believe the device has a manufacturing fault. I cannot accept responsibility for this. The phone was in my possession for less than 24hrs.