Exact same thing here.very frustrating. It won't charge when plugged in, still draining. The idle would not use more battery then using the phone. It's ridiculous. I've attempted several chargers which are working fine on my other devices....Amazon, Samsung, Chromecast, BLU, etc. I've used USB ports, wall chargers, PC charging, 2.1 auto charging, jump packs, etc.
I've missed several important calls for job interviews and from my children needing me.