The telephone number 0203 721 4139 is being used as part of a HMRC scam.
Telephone scam alert: If you receive a call from 020 3721 4139 do not answer. It plays an automated message claiming that HMRC has opened a tax fraud case and unless you press “1” a warrant for arrest will be issued #FraudAlert
— Syed Kamall (@SyedKamall) October 9, 2020
Do not answer any telephone calls from the number 020 3721 4139 as this is being used by scammers. They will then leave a message on your device suggesting that they are calling from HMRC and unless you press 1 a warrant for your arrest will be issued. Obviously this is a scam and you can be confident that this tax fraud case is fake. Anyone who does press 1 may be connected to an extortionately expensive premium rate phone line.
Do not interact any further with this message. You can, however, report this number to HMRC by emailing: phishing@hmrc.gov.uk
You can find out more about the tactics scammers are using to imitate HMRC and how you can deal with it on the HMRC website.