Fault battery

I have a problem here my husband bought me this phone Hisense U962 on Mothers day Sunday 12 May 2018 i charged it accordingly and on Monday i noticed the battery going down fast but i thought it was all in my head but now it's confirmed the battery is weak i have not started chatting with the fone but it does not last a day ,last night i charged before i sleep it was 100% and now this morning when i wakeup it was off battery was 0% kindly do something about this or i will not recommend this device to anyone out there i am so disappointed as it's my 1st time having a problem with new phone battery