Finally, a use for that blowhard Liam Neeson!
“I don’t know who you are. I don’t know what you want. If you are looking for ransom I can tell you I don’t have money, but what I do have are a very particular set of skills. Skills I have acquired over a very long career. Skills that make me a nightmare for people like you. If you let my daughter go now that’ll be the end of it. I will not look for you, I will not pursue you, but if you don’t, I will look for you, I will find you and I will kill you.”
Suitably altered to fit the particular situation, this is a good response to any scam call you might receive.