Google has another ‘known issue’ they are working hard to resolve.
Apparently some advertisers are not able to get to access billing pages in their AdWords Account. Google has offered up a suggested work around that may resolve the issue.
If you are experiencing this issue Report it to Google here
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Posted by: Kim Clinkunbroomer, GAP
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Next chance I have to wait – link to adwords support
Tomas,
Here is the link that is above to the Known Issue page.
http://adwords.google.com/support/aw/bin/static.py?hl=en&page=known_issues.cs
If you are looking for AdWords support you can use the contact link that is located on the bottom of each of your account pages. Also here is a link to their contact section http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=8206
Take Care,
Kim