CAR KEPT KORE THAN 24 HOURS WHEEL SPANNER WENT MISSING

They kept my car for full 24 hours with no communication given , when o went for collection next day still they were not done they had to install new hyndai system that I'm still confused about no explanation on why they do that and how does it work it's my car after all , with all that being mentioned days later I checked my WHEEL SPANNER WENT MISSING definitely after them keeping my car to more than 24 hours