I have 2 ways of dealing with unwanted callers- 3 if you count heavy breathing right back!
I have a loud whistle by the phone. I tell them I am going to blow it, then I do.
Or I ask the name of the company and say I'm registered with the telephone preference service and will report them. Doesn't work with calls from abroad. I just whistle to them.
Or I simply put the phone down.
Another thing. Don't EVER buy Pure Lifta face cream, tooth whitener or Acai berries via the internet. I don't know if they have stopped the sacms yet but you will find your credit card stung for loads of small amounts for clubs you didn't join, and large amounts for products you don't want. For each thing you have to phone America in prime time to get a cancel number- and they just change the name of the health club and charge you again.All you have to do is type the product and the word scam into Google before buying!
R