The call from BT, saying you have a problem with your internet - SCAM
Call from BT saying your Bill is unpaid and they will cut you off unless you allow them on your machine - SCAM
The Call From Microsoft saying your sending out virus's from your machine - SCAM
The one from Microsoft saying your security is out of date - SCAM
The email from n saying they have your password and you are webcam - SCAM
These are just a few of the current SCAMS doing the rounds
Any requests demanding a ransom should be reported to
https://www.actionfraud.police.uk/