Fuzion busy with *****!

Very very bad experience with fuzion. Quick to write a deal and take my old car in for a trade in and a week later they send me an invoice with all the faults on my old car and expect me to pay that. Furthermore today I found out that they never settled my financing of my old car, and the instalment went off my bank account. Now I have two cars installments to pay, one car and they want me to pay extra invoice on my trade which was never the deal. They took my old car but I'm still paying for it and it's still on my name?