I'm not sure but there are a lot of people complaining about them recently so If I were you, I wouldn't use them now.
Have Blockchain.info sorted out their issues yet? It's been a few weeks since your post, when do you think their processing will be back to normal?
What honestly your plan? you wanted to convert your bitcoin from blockchain to ethereum?
The only thing that i know would be alternative solution is to get the private key since you have your mnemonics you can follow magento said after you importing it into electrum wallet backup your private key where your bitcoin save and sweep it in coinomi after that use their shapeshift or changelly for cheaper fee when converting your bitcoin into ethereum..
This is just for alternative if you really wanted to do exchange your bitcoin into ethereum by sweeping your private key in coinomi you can also just send it in exchanges from electrum wallet..
I i heard lots of blockchain user experience this bug for a long time and until now they are still having this issue but the other blockchain user solved their issue by verifying they own the account from blockchain support, They are always delay in responds due to lots of customers so if you still wanted to wait for blockchain to solved your issue much better to wait for their responds and maybe they can fix your issue..