att kill me jailbreaked IP4 and Apple genius guy's won't fix it

jailbreaked IP4 death, it does have and charge only 17% of battery enough for star, but it won't charge more than that.

i have replaced battery and same deal also i get another battery and same deal don't want to charge more than 17-20% of capacity, also i have tried to reset to factory device, but t' links for doing that are all fade and don't work at all

so i suspect that att kill my device because i have unlimited data and i was excessive using tethering with my iPad

.

WHAT DO YOU THINK?

IT'S that POSSIBLE ?

and the genius guys and apple don't even give me an possible reason and just offer me tp replace my device for some money of course .

someone there can beat this guys and help to recover my device from death.