Called today with death threat

Recorded call telling me to press a number if I want my carpets cleaned. They've been calling me every week for the past five months and there's no one there for me to tell them to stop calling me. The whole call is a recorded message.

This person with a heavy Foreign Accent called my work # several times a day. Said he was from ACS this last time about a payday loan from Cash Express...I have never had a loan from that place. Others yes. This guys had two of my contacts whom I hope they are not calling either. He was told not to be calling me at work by my supervisor since we are not allowed personal calls, but he didn't care and still wanted to leave his #. He called again this week and my supervisor was busy and he left a message, called back 30mins or so later saying she had not returned the call..so now hes bugging my supervisor. This guy is gonna make me lose my job if they don't stop. Where can we report them? When they call my cell phone, the number comes up as 0000? what is that? Everyone beware...don't give any info.

This number appeared on our fax line and repeated after one minute. Annoying.

It is Regent Asset