Usually, I let them at least tell me what they're selling. Then I just tell them, "sorry darlin, you're just a few days too late, he just had that done, just bought one or just switched last month. Oh, I'm not sure who he used, but they were just here. He writes the checks and I don't have time to look it up, but thanks for callin us" Done. They can't sell you one, if yours is new.