I already read that you tried several chargers.
But did you try a SLOW charger? As in 5V, only 1 amp or so. Probably an older one just sitting in a drawer and with usb-A plug.
I have a tablet, that when drained to ‘power off’ wouldn’t charge with the charger I used before.
Worse:
it would say
CHARGING
then within seconds:
POWERING UP
Again a few seconds
BATTERY LOW (or depleted?)
SHUTTING DOWN
Which it did.
And repeat from ‘CHARGING’
The only way I could break that cycle was
Use an old, low-power charger.
I am not sure it will work for you, but you could give it a try.
(Is that last expression real English?)