It depends on how much time I have.
If I have no time, I say I am not interested. But, by the time I can say "please remove my number from your call list", they have already hung up on me. They inevitably end up calling me back at another time because I am still on their list. This is when I decide to play with them.
I have several different scenarios I made up in order to keep them on the line while entertaining myself as I go about folding laundry or some other mundane task while I have them on speaker phone.
One skit is a language I made up. This frustrates the callers and they end up hanging up on me. I use that one when I do not want to be bothered with them.
For the folks who want to consolidate my credit cards, I have asked them not to call me again, but they still do. So, I go through the process of keeping them on the phone for as long as possible, until they ask for my credit card numbers. That's when I tell them my husband has the cards on him, so no go.
When I won 5 million dollars and a Mercedes, I had to pay taxes up front. Of course this is a scam, but I pretended to be excited to win and keep the caller on the phone for a good long time, asking questions and what not. I was supposed to stay on the line while I went to Walmart to buy a Visa card and load it with $2,800.00. So, I had this guy on the line while I "found" my false teeth, my keys and all. Then, I told him that I was housebound for months on end and now my toe nails were so long, I could not put my shoes on. And, that I would share my winnings with him if he sent someone over to cut my toe nails. Ha, he hung up on me!
I figure, the longer I keep him on the phone, the less time he has to scam someone.
If these people did not pester me and take my name off of their call list, then they would not get treated that way by me. Those who are polite, get polite back at them.