Have you checked to make sure X, K, and Ka are not turned off? They should be on by default, but its something easy to check. Check the EZ-Programming section of the manual. If you don't have the manual, you can read it here:
http://www.escortradar.com/pdf/8500x50manual.pdf
If you want to test it, do a factory reset on it. To do this, power off the unit. Hold down the City and Dim buttons on the top and the mute button on the front, then power it on. This will return it to its default factory settings. Then drive to some stores that have automatic door openers. Large grocery stores, drug stores, and big hardware stores like Home Depot and Lowes have door openers that will set off the detector. Usually on X or K band. Drive as close to the door as you can. Try a few different places. If you don't get any alerts, its almost a certainty its not working.
If you determine its not working and you can't get the seller to replace it, give Escort a call. They will NOT honor the warranty, but they may be willing to repair it for far less than the price of a new one.
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