How can you be sure that they've broken it?
If it was loose, how you said, they couldn't broken it, it doesn't make any sense. Only, if someone cross threaded the bolt that hold the strut, then when undoing the bolt would require higher forces, which could somehow dislodge the internal nut, but the nut would stay on the bolt spinning inside, it would NOT come off.
Either the way, you can't be sure, because it was already loose when you gave them the car to fix.
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