Someone after my details, spouting taxation court case etc

Very threatening message left on my phone about police about to knock on my door to arrest me due to tax avoidance. Stating that they are from tax office. Many, many calls.
Have reported call to police who are aware of scam

Called twice and left messages about Taxation requesting us to call them immediately, threating court action and suggested we seek legal advice...Very upsetting...

I am presuming spam

A message was left on our answering machine at 4:11pm on Tuesday 5th January 2016, while we were not at home. A speaker with diction very difficult to understand, asserted that we had returned a registered document without signing it and that legal action, including possible arrest, would be taken against us for non-payment of money, and that we should contact our lawyer straight away.

three calls from this number claiming to be tax office - rang number back and sounded like in call centre - obvious scam

Recorded message claiming to be from tax office.
3 times in 3 hours