Who called from 2135503111

got call on cell phone too and they hung up

Recieved a call from this number the said if I completed a survey I would win a cruse I completed it and the call went out

hangs up after a few seconds, no one talks

This is the 2nd # that called me today & when I answered, no one responded. I called the # back & got a recording saying it was a expired survey & press 2 if I did not want to participate in any future surveys.......I pressed 2 & the message started from the beginning. I pressed 2 50 more times & the same thing happened. How do you block #'s from calling a cell phone????

5 rings no message left on machine
Northern VA