Google Base account disapproved, How do I get it approved?

If your account or data feed has been disapproved, you should have received an email from Google Base informing you of the reason.
Within this email you will be informed of how you can rectify the situation. It may simply be one product that does not comply and therefore removal of this item should see your account approved after re-assessment. However, in some cases, the issue will lie within your entire range or website.
If you did not receive an email from then Contacting Google Base is your only option. They, and only they have the power to re-instate your account back to a good standing.

You can contact them here:

http://base.google.com/support/bin/request.py?contact_type=error&ctx=direct