I've received 2 collection letters from CMI (AT&T's secret collection agency) over the past few months, saying I owe $440 for the AT&T (Dish Network) satellite receiver that I returned months ago when I moved, via UPS, just like AT&T requested. My brother, who worked at the same apartment complex, recommended that I hold on to the UPS tracking number because AT&T has a history of "losing" these returned receivers. Well guess what? It happened to me too! After calling and questioning them they said they would "check the warehouse" for that tracking number and call me back. They never did. Rinse and repeat - this exact same thing happened a couple months later. My question is, what do I do now? I was a good little boy and turned in the equipment and have a tracking number to prove it. They obviously mixed something up and need to fix it. Who do I call or threaten to sue? This is taking up a lot of time and frustration on my end because of them. And the charge has just shown up on my credit report this month. Not cool! After an internet search, I see that "CMI" has a history of such behaviour. What do I do now??? Help!