Should I return this man's phone calls if I know he trying to pitch me for multi-level-marketing?

[Andre]

I met a man who worked in my building and told him about my desire to move up in the company and he said that he may have business contacts. I gave him my contact information and he immediately began contacting me on a frequent basis. I went to his personal profile on Facebook and noticed links to many MLM sites and products he was promoting. I believe that's what he wants from me. Should I continue to ignore his calls or tell him to buzz off?