I'd be happy to try it for you if you've got no other options. Sounds like the shop may have made a right mess of what's left however
Did exactly this to a couple of bikes a few weeks ago. Worked a dream.
However, I did start the whole procedure by soaking the area in plusgas, which is magical go go juice.
You can also get massive screw extractors, bit of drillium and one of these has worked before as well.
@Chak started
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I'd be happy to try it for you if you've got no other options.
Sounds like the shop may have made a right mess of what's left however