Also received a call from PLC NPAC. Did an internet search of the caller ID info--PLC NPAC--and the previous post above showed up on the internet results. My call came from 952-529-4663, so you may want to check that number on 800notes as well to see if either thread comes up with an identity of the caller.
Also received a call with the caller ID saying PLC WPAC. Did not pick up and there wasn't any message. More harassment. I now have 2 1/2 sheets of paper with numbers that have been pains in the butt since the first of 2016. If it's not important enough to leave a message than stop calling.