I've been receiving these calls for over 6 months now. Nearly daily.. every time I get a call, I block the number and they still manage to call back from a different number. It's very annoying. My list of blocked numbers in my phone is so long!

Unknown number; no message left.

Same here. Received call at 5:53 central time. No msg. Blocking...

That number is a robi caller from  dealer services scam for auto warranty.  It is a fake number

Calls about auto warranty. Asks if you'd like to speak with an auto specialist,  if you say no it hangs up, if you say yes it hangs up.  Annoying as hell and I don't know how to block numbers. -_-