If this is truly Virginia Tech, they seem to have been doing this for a while (as prior comments date back to 2012) and they continue to be persistent. They don't give up! Nor do they leave voicemails. I might actually answer if I could confirm the number.
Confirmed, VT calling for donations, update personal info, and quiz on current status (employment, how I felt about time at Tech, value of the education, etc).