haha, wow, yeah i had put up a thread with the exact same dilema. And seeing that your from illinois, like me, I think im safe to say that sumthing in our state got messed up. lol Unless your letter is from the irs like you said, mine was from the state of illinois, and the funny thing is, my situation was exactly the same, i paid about 1500 for the car, and they say i owe 800-sumtin bucks on it! haha
But as for fixing this prob, its easy. There should be a number on that paper they sent you, for springfield, il. the capital. what i did was i called that number and explained to the guy what was up, apparently he said that if you had everything transfered at a currency exchange, like i did, it got all messed up. So yeah, you can either get the car appraised, and send that in, or send in the bill of sale. And there should be a sheet that came with the paper, where you can make any corrections to your registration.
Good luck
