Caller: A rude, obnoxious, annoying man

I have had several calls over the last few months from some kind of "asset investment firm" - I never catch the quickly-spoken business name.

The most recent call, I said I wasn't interested, and asked to be removed from their calling list. The person then started being abusive, telling me that he doesn't want to sell me anything, wants us to "make money". I asked him to repeat his business name, and he refused. I asked him for his website. He asked "why" and I said because I wanted to make a formal complaint. He refused to give me his website address. In the end, I jut put the phone down, and let him talk to himself. I heard him becoming more and more abusive, until he hung-up.