Please do not tell me that your solution for this problem is to tell the affiliate to unsubscribe my email address. That is NOT a solution that I will settle for from someone who is well known as a spammer.
Either take the strong actions that you promised to take, or take the risk that other problems will occur when I resume forwarding spam email to spam filtering agencies. Either way I am sick and tired of getting spammed and I plan to do something about it.
I recognize that you are not the spammer, and that you do not have very much control over the affiliate’s actions – but you continue to allow him to spam your operations.