I get calls from similar numbers (same except last 4 digits are numerically close) that never leave a VM message. One, ending with 0953 was I D 'd as "Ind Sur Group".
If I remember correctly, answering one of these similar numbers several weeks ago got me a political recording that I hung up on when I heard the beginning of it.
Caller ID identifies it as "HARG." It's a recorded message droning on about FHA loans. At least you are given the option to press 9 to be removed from their list. I reported them to FCC anyway as I am on the do not call list.