Hey @xmrsh,
reaching out to the Stadia support is the only thing you can do currently to get your deleted account restored as per this article.
Here is the contact form again to get in touch: Contact Us
If you still have issues to reach the team, but you speak another language for example, you could also try in the bottom of that contact form to switch the language and then try the form again.
And if that's also no option for you, you can also maybe try to reach a different Google team and check if they are able to transfer you to the Stadia team. For example try the Google Play team.
