Someone seems to be systematically downvoting posts like this. Just wanted to let you know that I feel your pain - I had an entire Google account shut down without explanation or warning. Lost all access to email, calendar, contacts, etc with no recourse and only a form to fill out that is never answered.

I believe the account was banned for a ToS violation that occurred 2 years prior. But I'll never know, just like I never got any of my data back.