man vs. broken bolt HELP!!

[4EverDrift]

when all goes wrong of course it will get worse.....

I recently picked up some ksport coilovers for my s13, and after several re-adjustments and 2 weeks I got it all nice and perfect.....and when I was tighting the last nut the little piece of shit BOLT broke I know, I know bone head move but seriously WTF.
I already got a replacement bolt from ksport, but this is where I could use some advice:

the broken bolt will not come out of the hole. I think it was slammed in there with a machine at high velocity or something.

heres what I tried:
spraying it that freeze off spray
hitting it with a hammer
twisting and turning the nub everywhich way
drilling thru the bolt (broke the bit)
but it still wont budge.

To be specific its one of the two bolts in the back that hold the coilover to the car.
Ive ran out of idea's and so im asking for any help with this prob.
ill post some pics of the broken bolt later. thnx 4 any help.........
just in case drop me a line if you know anyone selling 1 back ksport coilover