Unhappy with screen cracked due to phone over heat

Good day

Iam very angry now. I upgraded to a LG stylus 3 on the 29th December 2017 and i didnt have my phone for even 6 day. The phone gets extremly hot so that you cant touched it and then all of the sudden the screen cracked i did not dropped it or put something heavy on it there is not even a scrach of the phone nothing I just put it on the table i went to Vodacom Three Rivers and they said that if the phone is getting hot then it must be the battery I then went al the way to Vodacom Vanderbijl and they said that they will send it to head office. Now this is what make my totally upset this phone is still on warrenty now i have to pay R880.00 to repair it and iam sorry but iam not going to pay for it it wasnt my fault. The service is terrible at Vodacom three rivers an even at the head office. It wasnt my fault at all that the phone gets hot so that the screen cracked. We must pay and pay and pay but when you phone is something wrong with than Vodacom say no it is the clients fault dont understand that!!

Please help me because it is useless to fight with Vodacom