TRUWORTHS DECLINE HISENSE E60 cell phone warranty after 4 days

I have been a well respective customer of Truworths for over 25 years with a credit of close to R18 000.00. I have purchased in this time period more than 14 cell phones from this Truworths. My last cell phone purchase was last week Thursday 13 October 2022 at the East Rand Mall TRUWORTHS where I have bought all my cell phones in the past. Consultant by the name Jupton assisted me in buying this Hisense E60 cell phone.Total cost of this Hisense E60 cell phone was R2699.00 Got home and charged this Hisense E60 cell phone until it showed fully charged. When I picked up the phone the unit was extremely hot. Didn't think much of it and used the phone. Saturday I charged it again and once more it was extremely hot to the touch. I then saw the cell phone casing has began to pull skew I presume from the heat generated from charging the phone. I phoned the call center number in the booklet ( ***3 ) and explained to the person at the call center what has happened and I was advised to return the Hisense E60 phone to the selling outlet and they should replace it with a new Hisense E60 unit under warranty. As I have my own business and work long hours I could only return this phone today. Mr Malvic and a Martie both employees of TRUWORTHS East Rand Mall listened to my dissatisfaction of this Hisense E60 cell phone and I handed the slightly bend phone to Mr Malvic. He went to speak with someone at the back and came back and said they cannot replace this phone with a new unit as they will have to send it to Hisence as it is a mechanical failure. I told him I have spoken with Hisense over the weekend and was advised to return this unit under warranty and obtain a new unit. I have attached my invoice, customer pickup document and copies of the warranty booklet where it states any malfunction with this unit within 7 days can be returned and a new unit can be given. It is now day 4 and this phone has not been misused or abused or dropped or damaged in any way that could result in this Hisense E60 cell phone overheating when it gets charged. I believe this is a serious malfunction of the hardware(Battery). I am very dissapointed with the way I have been treated and with this Hisense E60 cell phone and I insist that this phone be replaced immediately with a new Hisense E60.