All govt agencies and banks contact you only by mail, except a bank might call if they discover something fraudulent on your accounts.
VA Pharmacy, my local clinic, and Community Care, call me. I get a call of some sort from VA about once a month.
I did get one call about six months ago that was suspec,t had nothing to do with my health care, ask the caller a few questions and determined it was a scam hung up and Called VA.
VA has a phone number and a place on the website to report, scammers.