Who called from 2062012070

Have been calling daily, and sometimes leave a voicemail.
One of the voicemails indicated a $39 special for an inspection on a furnace system.
Said they were calling on behalf of some clean air?? company (poor voicemail quality).

Received calls from this number constantly for days.  I pick up and no response they hang up.  I leave it to VM and no message.  WTF.

Repeated autodials from this number.  Most days there are two calls.  When I answer, nothing.  When I call back, quick hangup.  What sort of scam this is, I don't know but it does not seem legit.

I received SEVEN 7 calls from this number today alone.

Keep getting call from this number and no one respond. When I call back it doesn't go through.