You may try other means of communication to get in touch with them:
"
How can I contact Coinbase Support?You can contact us in several ways:
Email
Submit a request here. For the fastest resolution, please:
Submit your request using the email address you use to sign in to Coinbase
Choose the most relevant category and sub-category
Provide as much detail as possible regarding your issue
Twitter
We use Twitter to provide status updates regarding Coinbase products.
For security and privacy reasons, we're unable to assist with account-specific issues via Twitter. Please submit an email request for inquiries specific to your account.
Phone
Phone agents are available to assist if you believe your account has been accessed without your authorization. Phone agents are also available to assist with general inquiries about Coinbase and your Coinbase account.
For security purposes, phone agents are unable to assist with account-specific inquiries such as order status, specific digital currency transactions, or your account history. If you require assistance with these types of issues, please submit an email request.
Phone hours of operation:
Monday - Friday, 8 AM to 5 PM Pacific Time Zone
+1 (888) 908-7930 "
use the phone number of them that is faster and if they do not answer you by any means, then try to locate their headquarters and ask a relative or friend to go to it to know what the problem is that until today they have not solved your problem or just hire a lawyer to solve your problem