I returned my Verizon equipment years ago via UPS. I am still getting calls from a third party claiming I didn't. Each attempt ups the cost, then offers me a "discount" to pay for equipment I returned years ago.
As this is a peer to peer support forum, you will need to contact Verizon directly for assistance. We have sent you a private message with contact information for a dedicated specialist who is able to help with a resolution of your issue.