[ EXACT ANSWER ] Does Coinbase Refund unauthorized transactions?   

Coinbase fraud support directly at +1-833-326-6631. To get a callback from Coinbase fraud support, start by visiting the "Help" section on their website or app. +1-833-326-6631 You can select “Contact Us” and specify that you need assistance with a fraud-related issue. +1-833-326-6631 After submitting your request, Coinbase may arrange for a representative to call you. If you need more immediate help, don't hesitate to call Coinbase fraud support directly at +1-833-326-6631.