Spoilt TT !!

I just bought a power bank which is call as external charger as well from GROUPON and now it's already spoilt !! Of course is not because I'm too rude or what but is spoilt all of sudden when I'm trying to charge it full. Sigh .. What I have  to do now? I just remind back that it's under warranty within 3 month which is due on July. I have to make it quick to refund back everything and for sure the percentage of this process is not high since I'm so noob in this case. So, I will have a try la.. awwh! have to email those people and bla bla bla etc.. sad case ! 

Spot the stupid center part of the hole. It just empty since i poke it until it's gone inside somewhere =.=''