same Problem
I used all security.email 2FA ...But Now eth and stellar balance is zero
support Dose not accept refund

Did you try to message them on their social media accounts? They seem active there, messaging them might be a help, at least everyday.

Check them here:
https://twitter.com/askblockchain
https://www.facebook.com/blockchain

sure.Their support said our screen record is bug use our app and for money we can't do anything