Updated my contract to a Sumsung S8. After 3 months it doesnt want to charge the battery.

I have up graded my Vodocam contract. I have picked the Samsung S8.As you know you have to charge your phone for about 24 hours befare you can use it.As I put my phone on caharge it said that "Charging has stoped,battery tempreture is to and wil resume when tempreture is back to normal"Well because its a new phone I thought that it is a new think on the new phones. But then after 3 months it just got worse and worse.I have send in my phone for repairs and did received it back in about a week and they said that they have replaced the pc board.I got back home and put it on charge because it had only 10% power.After I have put in on charge they same wording came up about battery tempreture to low.After 3 hours it was still the same and after 3 days it still didn't charge at all,so it is now worse they what it was when I have bought it.