You can use the company's automated service to disable your account by calling the number provided if you think your account has been hacked. Clients can use an ACH transfer to withdraw their bitcoin at any moment in exchange for fiat money.

Usually, it takes 1-2 business days to finish these transfers. For a fee, Coinbase also offers 24/7 rapid cash outs to credit or bank cards.

Will Coinbase support ever call me?

https://medium.com/@cyptohelp/will-coinbase-support-ever-call-me-coinbase-help-c4a709a37edd