GMAC AUTO FINANCE REPO and not pick up vehicle? Internet

I suddenly received a letter saying my truck is gonna be repoed tommorrow! WHAT? I wasnt even behind in payments! So I called them and to see what was going on and they couldnt find anyhting about it in their system! Now what? They just told me to throw that notice away since nobody knows anything about it. Well I ran my credit score a few months later and lo and behold there was a repo marked on my credit! So I called them again. They couldnt find anything! About a year later I did end up losing the truck due to losing my job. And now my credit shows 2 repos-and get it-the same vehicle! Im never dealing with GMAC again! And if they think they can get the balance on the loan they better think again! Ill see them in court!