Honda Dealership being pain!! I need help to understand!! Please!!?

So i just got a new 08 honda fit sport on June 25 2008. Well on thur 7/3/08 a guy from the dealership tried to get in contact with me. Well i was busy and couldnt talk with him, so in Sunday he tried again and was telling me that the bank approves me, but not the amount to be financed. So they said that i have 3 options...1)give them 3 or 4 thousand more dol(which i def dont have!!!) 2)geta co signer (no one will!!) or 3) give back the car, and get my old one back...well with my old one they whole saled it out the next day...they had 21 days according to the contract to cancel the sale...but i have no idea why they are doing this...my old car i still owed 2900 on it and it got traded in for 2500 400 more dol were added on. can some one please explain to me, i dont feel like talking to the guy who keeps calling me b/c hes soo rude and if they take my car, they are going to have the worse end of the stick b/c i drive alot for work, and i almost have 1000 mi on it, and me very unhappy!