Multiple calls.  The number is not in service.  I was curious and answered one of the calls.
Caller was pleasant.  Identified her company as "Indoor Air Quality".  Claimed to have serviced our furnace in 2010. (She didn't).  I suppose she earns commission for sending qualified prospects to some local air duct cleaning company.

This number has been calling since June and continued to call. They also use the number 2621906 with various ID. Did not answer. Left message on their web to discontinue the calls but to no avail.

I've been receiving calls from this number for the past few weeks.
Haven't answered yet.

We keep getting calls from this number. Most recent claims to be Air Duct Cleaning and also claimed to service us in 2010 - they didn't. I asked the man to take us off their call list - he said "what call list?. We serviced you. " I said, please stop calling and his response was OK, I'll give you a call tomorrow! I hung-up. Very frustrating!!