HMRC recommends that if you cannot verify the identity of a caller, do not speak to them. You can check GOV.UK for information on genuine HMRC contact and on how to avoid and report internet scams.
I would encourage Inverclyde residents to be aware of potential fraudsters who try to spoof legitimate HMRC phone numbers.
If you notice anything suspicious then please email phishing@hmrc.gsi.gov.uk and send suspicious texts to 60599