There's no way that Greenaddress will scam someone, they operate their service for years already. And this situation there's a big possibilities that their 2fa has a glitch, or something on their sms provider. So all you need to do is contact them through their social media accounts if they have, or their support email, or contact page on their site. And you have to wait them replied you.
Yes green address has been around for years but it doesn't mean that they can't be a scam . Although in this situation I have to agree with you cause if greenaddress is really scamming people we would have a massive complains here
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A glitch is very possible, I encountered a bunch of them in different sites
The problem is that they just don't respond on their support email.
You should send another email (quoting your previous conversations) . It is a popular web wallet I'm sure they get a lot of messages . It's possible that they might miss one or two emails .
Have you already posted this on their subreddit here:
https://www.reddit.com/r/greenaddress/ . Their twitter here:
https://twitter.com/greenaddressIf you found a glitch or something, go to their repositories here:
https://github.com/greenaddress?tab=repositoriesEDIT: Definitely post on their subreddit, I found some similar problem that has been resolved already by the greenadd team Similar Prob 1 and Similar Prob 2