I sold my home. Had Verizon to cancel my service on 03/28/14. They sent me the box to return 3 top set boxes, the remotes and a modem. Mailed in one box, using the USPS label they provided. Called 3 weeks later to confirm they received the equipment back. Said it was. Verizon owes me $$ from my final bill. Several weeks ago, I was told my refund would be mailed on 05/22/14. Instead, I got a bill on 05/25/14 billing me 350.00 for an unreturned box. When I try calling, all that happens is I get transfered from dept to dept to dept and no one is willing or able to resolve this.
What do I have to do?