Who called from 203151234

This has happened to me 3 times today and twice yesterday. It's not even a whole telephone number with only 9 digits. Very annoying!!

I got a call from this number today. It was an indian man. (Dot not feather) He asked to speak with randy.
Me: i'm not randy. idk randy please take me off your call list.
Dot: who is this?
Me: none of your business.
Dot: if you don't tell me who this is I will report your number and block this phones line....
Me: I'm Courtney.
Dot:thank you. I'm a detective
Me: long pause... OK? Bye.. I'm a little weirder out...

Verification officer... Not detective. Wtf is a verification officer? It sounded like a call center in the background....

Just got the same call-- t-mobile subscriber in Wash state-- showed up as visual voicemail but nothing visual about it, mostly garbled audio

I don't know this number, doesn't even look like a real number and I keep getting calls from it