HP India — about battery failure...

My dad and my brother are using hp laptops and they asked me also to buy a hp laptop so i bought a hp laptop. But now i am very disappointed withb my decision. Here's what actually happened:-
I bought 15-ak007tx gaming series laptop on[protected]. Initially it was working good, but after 5-6 months it started slowing down. But i didn't pay much attention towards that, so i carried on. Like while booting up system it was taking time. I was a bit upset with laptop coz it's named as a gaming laptop with intel i7 processor, but still it was taking time to respond. And i was facing one more problem from starting about it's battery backup. Sometimes it showed 4hr remaining on 100% charge and sometimes 2 hrs. This problem continued but i dealt with it. Now on[protected] when it's battery level was 12%, i connected my cahrger but it showed pluged in but not charging. I thought there migth be some issue so i restarted it, but the same problem continued. Battery wasn't charging, it was living on external current provided by charger. And now its not charging.
I m seriously disappointed with my experience with hp. I[censored] guys can help me,
I just want my battery to be replaced.