Who called from 5052570743

I don't have a clue. The call just interrupts what I am doing and no one is on the other end.

I Rec'd a Call from this Number around 12:20 PM Today 03/17/17 and when I called the number back, it says that it's an Invalid Number.

I called and it said "expanded research line"

I've gotten two calls from this number. There was no one on the other end & they hung up when I answered. I called it back and a recording said they don't accept calls from blocked numbers.

They left an 8 second message of nothing. No idea who it is and I will not bother to call back after reading the rest of the comments.