Why is my ZTE blade buzz won't charge?

A

AC Question

My ZTE blade buzz phone won't charge at all. When connected to a wall socket(using own charger) , the charging indicator shows up, but percentage stays at 0%. I tried charging it from PC using it's own USB cable, but in vein. Sometimes even the charging indicator doesn't appear.
I tried using an external battery charger. Even if I charge it fully, 100% drains to 0% withing 5 minutes.
The repair shop I took my phone to assumed it has a problem in charging IC and changed it, but it didn't help either. When somehow it is turned on, the software seems to work fine.
Please help me. TIA!
 

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