Reboot it by pressing and holding the power button for a full 30 seconds.
From where did you buy it?
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How to contact Amazon CS:
Use the HELP link at the bottom of any Amazon page, then NEED MORE HELP...then CONTACT US...and CONTACT US again...select CALL or CHAT. The Call option allows you to input your phone number, and they will call you. Don't use email, and don't Google for a phone number, the results are scam numbers.