Unfortunately transaction is irreversible, there is nothing blockchain.com can do to get back your funds. In their answer, they explained the possible causes that led to your account being hacked. Using online services for storing cryptocurrency is considered as one of the least secure ways which are currently available to users.

When you say that Google and Yahoo protect your account, is that means that you have enabled 2FA (Two Factor Authentication)? You are probably victim of phishing or maybe keylogger, scan your PC with antivirus/antimalware and check your browsing history for site similar to blockchain.com.