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$1200 a month in income may be the issue you have to contend with.
A year ago when I got my loan through them I ended up needing a cosigner because my income wasn't quite high enough. It was a CPO that I got a great deal on and I had a little over 20% down payment with an out the door price close to $14,000. I pay no rent so it's not like I couldn't afford the car, but even so they have a minimum income level. I THINK it was $2500 a month. I can't remember exactly to be honest. That is probably what the issue is. Try some credit unions. Especially as long as you have a down payment you should be able to get financed. On a side note... What kind of car are you looking at?
The income maybe a little low, made 1800 per month at 18 years old with a 655 fico and still had to have a cosigner.