Well they may not have been able to get the cv axle out of the hub. So to save your hub and bearing from the destructive forces needed to remove the axle, they probably just took it apart. However, I'll never understand how mechanics seem to think that a pissant zip tie can hold an axle boot on. The worst part is that generic stainless steel tie straps are cheap and available, and there's really no excuse not to keep some around your shop.
If I were you I would give them the keys and say nothing besides: "You ziptied my axle boots on. Fix it right this time."
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