robocallers, the number is possibly spoofed, with some kind of credit relief scam. they call numbers on the do-not-call list. if you pick up and answer, it says some garbage about how they've been monitoring your account and press (random number) to speak to an operator. push the number then set the phone by your TV or something to waste their time, make this dog sht a little less profitable for them!
Got a call and an auto attendant saying "you can pay back the remaining balance with a 0 percent interest rate. press 9 to speak to a representative" I hit 9 to ask that they remove my number from their calling list and the lady hung up on me. I tried calling back and the number comes up as disconnected.