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bobble
Ok firstly what car and engine is it. Did the garage give you the codes? Was the car starting easily during the cold snap?
Is the garage a diesel specialist? Glow plugs are easy to test in situ as you just test the resistance, do you know if the garage did that? How many plugs have they removed so far and how many have broken? I'd speak to the garage and see what guarantee the engineering firm can get the plug out damage free.
I'd try and find a local diesel specialist and ask for what they would do as they may have better experience in removing broken glow plugs.