Called my Texas Landline 06-15-16 at 10:53 guy said was from HVAC Services Caller ID displayed Out of Area I advised remove number from list and do not call back he HU.
972 is Dallas which is Texas so in 2-3 minutes one can fill out online complaing forms for Telemarketer Complaint Form _ Public Utility Commission of Texas
https://www.puc.texas.gov/consumer/complaint/form/ComplaintForm.aspx?type=m
State agency is more proactive than federal. I encourage all to file on these leech numbers. Easy peasy..