I like to answer these calls and speak with a rep. I tell them how interested I am in their product or service.
When they ask for payment, I tell them to hold on, then I put the phone down and just wait. The reps start calling into the phone, nicely at first, and then they get very frustrated. I had one rep calling into the phone for over 10 minutes..."hello, are you there, are you there, hello..."
I finally came back and started laughing at him. He was pissed and I had a good laugh.
If a person wants to be a bottom feeder in life, well,that's their choice. I never signed an agreement that I had to be polite to these low-lifes.
Next time they call you and try to waste your time, get even have a laugh at their expense.