Dear AppEngine people (I understand that all AppEngine support has moved to StackOverflow - if I am mistaken then sorry for posting this here), I have a very serious problem tha
Per the billing FAQ's
Why did my mail quota not increase after I enabled billing?
Google will wait until the first payment is cleared before increasing your mail quota. This means it will take at least seven days to get the higher quota.
https://developers.google.com/appengine/kb/billing#quota_increase
DISCLAIMER - I am not affiliated with Google in any way, nor do I believe you can get an official response from them via stackoverflow.