I am having a problem getting the Caliber.

I am having a problem getting the Caliber Mounting Bracket Bolts off the car. Heat has been applied and 2 tools were broke in different attempts. The person that was doing it said that someone put the wrong bolts in it. He was able to get one off with no problem. Any suggestions? I don't have much $. I have called dealerships and got an est. From $100.00 to $400.00 depending on whether they can get it out without having to drill. I told them I already have the parts that need to be replaced besides the new bolts. Is this a reasonable price? What should I do? I don't have $400.00!