Moris Mutal wont give my car back!

You can see they have the car? Or are they 'too busy to answer'. I had the latter not long ago, turns out the car wasn't insured. I thought the garage did both automatically, since my cars always seemed to have both. Then discovered that cars nicked off the street only get tracked, you still have to buy insurance for them. I don't know how I went so long before finding this out.
I had a car at impound the other week, icon was there, car wasn't. Had to change session to get it to show up.
You could call your mechanic to see if he has it on his list, heard a few glitches that have been resolved that way.
Lastly, have you looked in your garage