ATT Returned equipments; still got hefty bill Houston Texas

I had uverse for more than a year then I moved and disconnected my uverse service about a couple of months ago. I returned the d**n equipments (two receivers and a gateway) a couple of days after I moved. Did it via UPS as instructed. Two months later I got a check for about $85 (credit on my account) from ATT so I assumed they had received the equipments and threw away my receipts (I know, MISTAKE!). About a couple of days later these idiots emailed me a bill for about $487! I called them multiple times; some of them are rude and really dumb and couldn't even locate my account in their system. Finally someone was able to find my account#. Even though I had tossed the UPS receipts I was lucky enough to find the tracking# by calling back UPS store. I gave them the number and they have told me to check back next week. I hope this get resolved fast and painless.
I can't understand why the heck they sent me a check if they had not received the equipments?! makes no sense.
There are a lot of rude, stupid people at their customer service; they even hanged up on me! My advice is that keep calling them back until you find a helpful person.

Zartosht
Houston, Texas
U.S.A.