Q: I keep getting spam email from this stupid sponsor and I don't even use them anymore! I'm about ready to call them out on the boards about it! I am so sick of it!

A: Why not just filter them out with your email program? Block them from sending mail to you?

If you once promoted them then you are still on their mailing list and the fact is you opted in. Just because you stopped promoting them does not mean they removed you from their list of webmaster emails. Just block the email address. It will save you a world of grief and headache.