Caliper screw stuck?

We attempted to change the brakes. Lucky us one of the screws to remove the caliper was stuck. My dad wore down the screw intending to replace it once it was removed. We couldn't take the caliper off to reach the brake pads. So we took the car to tire kingdom and had to pay $120 for new brakes (front brakes). The mechanic there couldn't get the screw off either (he said it was frozen, is this common). So he changed the brakes with rotors that needed to be resurfaced. My dad says that the brake pads will probably conform to the shape of the bad rotor and be unusable later.

So my question is, how do i remove a caliper with a frozen screw to replace it?Caliper screw stuck?
you will have to heat it up to loosen the bolt and use WD-40 before you heat it up, you should be able to get some large vice grips on the bolt if you have it rounded off.Caliper screw stuck?
Soak it with some penetrating liquid (ie. plus gas, wd40, etc..) for a few hours then use mole grips to undo the screw.Caliper screw stuck?
I don't understand the question, need more info, what make of car are you talking about.Caliper screw stuck?
heat it up with a hand held torch not red hot

if not drill it out and retap itCaliper screw stuck?
As long as there is a stub of the head of the screw sticking out, then try to weld a nut onto the stub then use an impact wrench to remove the fabricated bolt.

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