You don't want to go overboard, even if it they WERE wrong for marking it as spam. That's on them, not you. Take the higher road and go on with your day. I believe, even online, that you reap what you sow. I believe you made some honest mistakes, but now you have to learn from those mistakes. =)
No no no! You really shouldn't have posted another thread.. I don't think it was a good idea. You might get banned or something... I really think you should let it go, even if it does seem unfair.