you can make a new registration, for example from your smartphone,if you have any questions I think you will not be difficult to confirm your email to support.

try an old school letter?

Here you will find their address.
http://www.dfs.ny.gov/legal/vcrf_0500/20140828%20-%20VC%20Proposed%20Reg%20Comment%2096%20-%20Coinbase.pdf

They are not a scam, so I think this will all work out. However in the future NEVER leave bitcoin at an exchange for more than a few hours. Until you have EXCLUSIVE CONTROL OF YOUR PRIVATE KEYS you simply do not have any bitcoin.

Such a big bitcoin you are holding a 10 btc in coinbase i think you can not recover except if you contact them directly since you block your account and you want to reopen it again with bitcoin inside. they can get it back once you contact them just give some proof try to contact them here https://community.coinbase.com/t/live-chat-support/10903
Maybe they can reply you soon in their community site..

When you say "answers that they simply do not have email support" do you mean you EMAILED them directly using the old "support" email and got the auto "In an effort to more quickly respond to requests, directly emailing ...is no longer enabled" message. Or did you use the support form?

That's tough. don't stop trying to contact them. Get as much attention as possible. I suggest posting it on reddit's /r/bitcoin and /r/btc to get more attention. make sure to explain things carefully.

After you regain control over your bitcoins, I suggest to always move your bitcoins out of your coinbase wallet into some other wallet like electrum/mycelium. I've seen too much people having problems on coinbase.

How exactly did you block your account? You'll probably just have to try different methods of contacting support. Maybe try messaging them via twitter or something as well. If you have coins in the account, they should have some obligation to help you.