no message, just ring and then hang up

they keep calling every day and i filed a complaint with the do not call list.
i also traced the number to a locksmith in aurora,co.
the phone number is 7202466787, but they say this number is not active.
the company name is elkhart locksmith service.

the name of the company is  elkhart emergency locksmith services
located at 2546 S. Elkhart St. Aurora,CO. 80014

this is an insurance broker