Can a new car dealership change my initial loan without my permission?

I bought a new car from a local new dealer. After my purchase, a few weeks later I started to receive loan info. from a different loan company than I took to the dealership. I called the dealer and they said that they changed my loan company without my permission. They stated to me that my loan company need more info. and the did not want to disturbed me. So, I called my loan company to see what info. they had need and they told me that the deal just never submitted the loan for funding. The dealer told me they change loans on people all the time. I feel like my finances should be my decision now somebody else's.