A PartyPop rep called me out of the blue and began by thanking me for signing up for PartyPop. I told them I don't recall doing that and then proceeded to ask questions about who they were and what service they provided (I had never heard of Party Pop). When I finally made it clear that I had not signed up, the guy hung up in mid-conversation.
To be clear, I am very polite on the phone when dealing with cold-call sales people because I used to do it and I know how stressful their job actually is.