I think I screwed up because I bought an used Chevy Volt (thats in repair shop btw for BECM issue a week after delivery) and the used car dealer has refused to furnish Form 15400. I literally gave it to them twice and the salesmen said they would complete it the next day and I still haven’t seen the form yet. I was really depending on the 4k tax credit for the car and this is really bugging me since they keep saying they will complete it but they refuse to do so. What should I do