It's pretty easy to get out if you've got access to a mig welder. Weld a smaller dia bolt to it and you should be able to pull it out without taking off the drum/rotor.

^ Weird you should mention the impact wrench. They say they'l rotate my tires for free. I'm like 'okay, good deal'. We'll not so good 'cause when I go to change the tire next time, every bolt is way too tight. 8 bolts later and.. snap.
They weren't suppose to turn it up to full impact, fuck that! and normally check it with a brace after it.
Hope you went back there and ripped their heads off.

Just bang the friggen thing through.
Put the new one in and suck it up with an impact gun
This normally works for me, ^ dependant on the car of course.

Drill into the centre of it with a bit that is decent smaller than the stud you want to remove. Tap a left hand thread into it. Wind in bolt. Unscrew.

If you have ever dealt with this before, it shouldnt be a question. Go to the parts house and pay the man 2 bucks for the stud and nut and follow his instruction, which by the way is the same as quoted.....punch it through the back with a medium sized hammer and a punch. Knock it out, put the new one through the back and tighten it with the nut to pull the stud until its seated against the axle hub and use the prescribed torque specs!

-or- take it back to the tire place and make them do it right.

It didn't even dawn on me the car might be one that uses bolts instead of studs.
The op did say" snapped bolt"
I wonder how he made out?

It didn't even dawn on me the car might be one that uses bolts instead of studs.
The op did say" snapped bolt"
I wonder how he made out?
If worst comes to worst with a stud you can grind flats onto it and use a puller, with the aid of a little heat, to rip the fucker out. I wouldn't recommend it as a first option though,ahah.