Refer as you mentioned. We always check when the product is returned. When my team check it, it really was not possible to turn it on. If we check the product we check it with the charger that is included in the package, if supplier is checking with a different charger the charger may work and where the included charger does not. This is outside our control.
For the second case please see the details from the ticket 320389,You will know why the customers return the product back.
I have told you this already. If you have and suggestions, please state them. If not,do not simply restate the problem. That is an exercise in futility and wastes your time as well as mine.