Call me Mr. Professional

Well, yes, sometimes I don’t act in the best way I can, but sometimes I think people don’t know what does the term Professional means. Well, almost everyday I get a call from someone, who has a job for me, either a free lance or a position in some company (and I don’t know where the hell do they get my phone number, is it published somewhere I don’t know about), and I make it very clear that I’m not interested, and of course if I didn’t answer, they try again and again and again. Usually these phone calls ends with a request that if I know someone who is interested to let them know, and actually I do that. One of these guys, had a project, and I made it very clear that I’m not interested, but he kept bugging me trying to convince me, and of course he made that request, and actually I gave his contact to another 2 guys. He kept calling me asking about contacts and stuff, and for almost 2 weeks, I kept ignoring him, until today, he left me a message on my voicemail, telling me how much unprofessional I am for not returning his calls and ignoring him. Well I don’t know, maybe I’m wrong, but isn’t it your job to look for the people you want, aren’t you the one who is in need for them, not me, and do you think you “Mr. Professional” that it’s professional to let people who made it clear to that they are not interested, by wasting their time trying to make them do your job. I don’t know, but what does this sentence means, “I AM NOT INTERESTED”, cause if it means any other thing than it sounds, maybe I should change it, use another wording or something.