Who called from 3034776256

I have gotten a call from this number twice today so far on my cell phone.  I do not answer calls on my cell phone from numbers I do not know.  Anyone know who this may be?

Yes!. This phone number 303-477-6256 belongs to Affordable Home Security an authorized dealer of ADT.

I got a call from this number too and when I called back- 3 times, they hung up every time.  I am concerned this is a scam and not an authorized ADT dealer.