I returned both my router and DVR to verizon in the same box via UPS. For some reason, I got a letter today saying the DVR hasn't been returned and only the router. However, I had a notification on my account months ago that everything had been returned. It has been months since I have cancelled my account and this is the first I am hearing of this.
Hopefully you saved those documents saying all was returned?
you could call your states Public Utilities Commission or Public Service Commission who regulates Verizon’s services and has quicker resolution to such issues.
i have another option I can tell you in private since I cannot discuss the legal aspects on the forum per the terms or service.