The latest for me was last Friday...I got a message from Verizon that my service had been suspended and to call them back, and they left a number that was close to the Verizon Customer Service number.
Instead, I called the usual Verizon Customer Service number (from my cell phone, which service had been "suspended"). Yep...it was a fake. Gave them the number and let them deal with it.
Have you tried Verizon's new app "Call Filter"? It blocks numbers that don't match their caller id. I've been running it for the last month or so. I've gotten one call that Verizon warned me as "possible spam" that I answered anyway (work phone). And it was.
It's a free app.