whileonebegin

I check my email to find a message from Coinbase saying "You just sent 0.136 BTC to 12aW81234567890abcdefg..". I never initiated such a transaction. Obviously, I started freaking out a little bit. I log into my Coinbase account (which I felt had a strong password btw), to find my balance near zero. Just great. Thank goodness I hadn't linked a bank account in Coinbase yet, and that the stolen balance was less than $100, who knows what else may have been stolen. I filed a support ticket with Coinbase just hours after this occurred last night, but no response yet.

I'm distraught over this. A hacker can simply break into your account, steal your bitcoin by sending it off to his own account, and no one has to hold any type of accountability? Is there no way to trace, cancel, or reverse a transaction? Is there anything at all I can do?