No way to disable billing for disabled account

[Yorke Lee]

I worked as an intern(yorkelee[@]google.com) at Google over the past summer(May - July 2012) and was working on an appengine related project.

I've only recently come to notice that I have been billed $2.10 for appengine usage per week over the past 4 months or so, even though my account has since then been disabled and the project is probably not in active use. I've been looking for a contact email/number to disable billing for the project but haven't been able to find any. Could an administrator help me out with this billing issue?