Verizon Spoof scam

I received a voicemail from the 412-226-6640 phone number. The voicemail stated that I had equipment to return to Verizon and needed to do so to avoid a late fee charge. The Voicemail left a separate toll-free number to call Verizon to discuss return methods. Just recently, I actually did cancel Verizon services. When I called the toll free number listed in the voicemail, the line also listed the accurate address for which I just canceled services. Nonetheless, I called the 412 number back to investigate. Someone answered, and took my name and phone number. They did not request any additional information. The person I spoke with told me that I could return equipment within 30 days to any Verizon store that accepts equipment, and I should have my account number ready to return the equipment. Again, they did not ask for a Social Security number or other information. However, when I asked for a reference ID for the call, they would not give one which I found suspicious. I then called Verizon’s main service number to discuss the incident and even they agree that it is a bit suspicious. I believe this could be a scam caller leaving voicemails about equipment return, and including an actual toll-free number by Verizon in the voicemail to appear credible. I believe the purpose of the scam is to confirm active cell phone numbers for future targets.