This number might be another spoof number to sell alarm systems. They called from (915) 533-0469, and I faked a dropped call to get rid of them. Only 2 minutes later, a call came from (972) 532-7134, which googling revealed to be another alias number for alarm systems. Then the call from 972-528-0084 arrived only 3 minutes later, followed only 30 seconds later by a repeat from (972) 532-7134. A final call arrived 10 minutes after that from (646) 915-0451. Googling this also revealed comments about a home security system scam. So I'm posting all of the numbers in that cluster of calls so as to help link them as different tentacles of the same scamsters.
The fact that other searches show (972) 528-0084 to be a VOIP number in Carrollton suggests strongly this is probably another alarm system alias / spoof, trying to see if I'd answer calls from any other city.