on the phone, scammers draw you into a friendly relationship and might ring back several times to build that relationship so that you think they are trustworthy. He said put the phone down and don`t be polite, just do it
I pulled my plug in phone out after getting scam calls and never answer my mobile unless it is from a known contact. If I don`t know the number calling then I will google it to find out eg last one was about fabric from a shop, so I rang them back.
He said that they use multiple dialling methods and if you hear a click after you pick the phone up, then put it down straight away
sorry to write so many posts but if one scam can be prevented then it will have been worth while