I bought it in December , and one day the battery was low and it just switched of by it self. Then charged it but the battery did not increase even by 1%. when I plug the charger sometimes it vibrates with a small line flash of light and it does not show the charging sign. Before this one day it was not charging but after one day it started charging and it worked properly.  But now it is not charging at at all. i have plugged the charger for three days straight and noting . when i tried to activate the phone it says ' processing low'  what should i do?? please help me!!