Who called from 2146192867

Call was from Clearwire Internet service that I have.
They called to try to get me to upgrade my service.

has called my phone twice now not sure why wont leave message. Called back and like the other person said it asks you to click 1 2 3 and so on. I clicked 1 for clearwire and no one would pick up the phone I left a message asking them to stop calling me.