Google has banned me

From all Google groups, that is. The weird thing is that I can do less when I'm logged in than when I'm logged out (because then, they don't know that they have banned me). This seems to be a common problem and to add insult to injury, many resources for fixing it are only available in Google groups itself (if you are logged in and not banned). There is not direct solution, so I've tried indirect ones:

• Disable autoresponder: this leads to Google checking if the account has been blocked due to too many posts made via email. Some people have successfully (ab)used this to get unbanned.
  
• Feedback about Google Accounts: One step higher up the Google chain, this is one of the few generic options for getting in contact with Google. I left a note.
• I sent a fax to Google Inc.: Yes, there was real paper involved.
• I gave feedback on the GG help site (which obviously was negative).
  

So far, none of this has worked. And I recommend the following website: google-alternatives.com.

“Sorry... The owner of this group has banned you from this group.” This initially mislead me to believe it was a one group thing.
“Forbidden. Your client does not have permission to get URL / from this server.” Slight problem: Most of the resources for figuring out what went wrong are on exactly this server.
Update: At least I haven't lost money: “Google is Evil, Worse than PayPal: Don't use Google Checkout for your business”. In Google's defense, they do have to deal with a huge number of customers and with a lot of fraud. Still.