Repeatedly calls my cell, no message

I keep getting calls from the University of Alabama,  The caller does not leave a message.  I am on the do not call registry and yet I get unwanted calls all the time.  I work odd hours and at times I am sleeping.  If they are going to call, they need to leave a message if I don't answer.

same as above, very rude to not leave a message. it is most likely a fund-raising call by students. they used to leave messages, but new regime has apparently  decided differently.

Unrecognized number. Blocked for the future. Blacklist #422.

University of Alabama calling to get donations.