UPS lost router, ATT doesnt care

I saw that I was charged $170 on my account for the rented router/wifi equipment, after it was closed, because we moved. It was after 30 days, so I called to make sure I would get a refund even if I sent the rented router back. If I couldn't, I planned on keeping it. I was told, "of course! just take it to a UPS store." So I followed the directions on the website and from the representative and dropped it off. 2 weeks later, still no word from ATT. So I gave them a call to check in. I was told they didn't know where the router was and they would open an investigation and give me a call back in the next few days. No call happened. I called AGAIN a few weeks later because I was closing the bank account my ATT account was associated with and wanted to make sure I would be able to receive my refund. They said sure, they would send a gift card and still had not received it. 

At this point, its been a month. ATT has no idea where it is and has "closed" my case. I have no router and am out of $170.