60% Plugged in Not Charging.

Hello Everyone,

About 1 Year ago i Bought a new DELL 5521 it was working fine, but like 2 days ago i was playing games in battery mod, it suddenly pop low battery 6% or maybe 10% so i force shutted down, and like not its charging up-to 60% or 65% and after this it says Plugged in not charging... i don't know why its not going above 65% percent Please Help its Really Argent For Me.. i Tried SEVERAL THINGS PEOPLE SAID, in Google in Forums Nothing Worked Please Tell Me What Should i do??? & it Also Sometimes Plug and Unplug By it Self Like for 2 Seconds it Unplug it Self, and then plug again and i dont know why....