HISENSE T5 PLUS FREEZE, SWITCH OFF BY ITSELF AND AT TIMES DONT WANT TO TOUCH!!!

On 07 june 2018 I bought a Hisense T5 plus cellphone. From day one the phone freezed, it turned off by itself and the screen didn't want to touch at times. I took it back to the Foschini store on 12 June 2018 the store consultant phone Hisense and talk to one of the consultants and explained to them what the phone do. The consultant said to her to send the phone through to 3G. WHY COULDN'T FOSCHINI JUST REFUNDED THE PHONE CAUSE I WAS IN MY 7 DAYS!!!They "test" the phone and according to them nothing is wrong with the phone. The returned the phone almost after to the store and still nothing changed. The phone is dead. The battery life os also s***. I'm not satisfied with the purchase nor the reply I got. So now I have to pay a phone that I couldn't even use for one straight day. I have to use my daughters phone now. HISENSE T5 PLUS HORRIBLE PHONE, I WANT AN ANSWER. HOPEFULLY I'LL GET ONE.