Very convincing as Natwest Fraud. But NAtwest Fraus never rings you! They block you and wait for you to come to them. They never ask you for three characters of a pin or password. They will never ask you to read a number from a txt message and they will certainly never ask you to validate your card in a card reader. Education people. Don't be scammed.
Do not under any circumstances engage with anybody calling from this number. They are scam artists. They pretend that a sophisticated fraud has been committed on your account and that they have to close it down and open a new account. They ask for your help in doing so. They ask you to to use your card reader to do this. When the real Nat West fraud department calls you there is no caller ID shown on your screen.