Millie22
They are some awful nasty people involved in these scams. If they find someone who seems a bit 'gullible' sorry about that word they then pass the person's phone number on to other scammers. Did anyone read that the head of HMRC actually had a scam call himself.
there is a big trade in suckers lists.
any response, eg answering the phone, get you added to such a list, which are compiled and circulated for fat profit.
there is no honour among thieves. and no such thing as a free lunch, nor a free suckers list.
it's best to let all unknown callers go to answerphone.
and get caller display for landline. call guardian is excellent.