<human>: Can you give me a shortened version of the text?

Sorry for the wall of text. Here is my dog 
Well I purchased a 2015 Pruis C two from a Toyota dealership in SoCal and I spent a lot of time explaining to the salesman my terms for the purchase. I stated 9K was the absolute bottom for my trade in car, then I went on to say my absolute max I am willing to spend on this model was fair price ($19,930.00 edmunds.com). After his repeated trips to his boss and attempts at getting me to budge I stayed firm and told him I was in no rush to which he accepted my terms and shook on it. I was then transferred into the finance department to wrap up. I went through and signed all the required transfer paperwork then we moved to signing a digital form on his computer he briefly went over sections for what each signature was for but never displayed the price. Later when I got home I went over all the paperwork and saw the pricing had been changed to $20,590 and the trade in value of my car was $8500 with a $500 credit applied. I immediately went back to the dealership to inform them of the mistake only to find the sales manager that handled that car had gone home and won't be back until Wednesday 4/29/15. am I screwed cause I already signed the document or is there anything I can do.
<bot>: Shook on a price of $19,930 signed the digital paperwork and had it printed to see $20,590, can i do anything?