If you don't recognise the number then don't answer it. If it's important they'll leave a message.
Simply by answering you are confirming they have hit on a live number which will be added to yet more lists and sold on.
Since adopting this policy a few years ago I can't remember when I last got a call from an unrecognised number.
Actually we have had a few ,rather than very few,recently; all international or out of area and none of the fake number ones.
However,to order rewards from Valued Opinions, you have to wait for them to ring you with a code, which when entered releases the reward and their call came through as out of area,but I answered as it was expected.
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Simply by answering you are confirming they have hit on a live number which will be added to yet more lists and sold on.
Since adopting this policy a few years ago I can't remember when I last got a call from an unrecognised number.
However,to order rewards from Valued Opinions, you have to wait for them to ring you with a code, which when entered releases the reward and their call came through as out of area,but I answered as it was expected.