Sounds like some moron put your wheel bolt (not lug nut) on with an impact wrench and cross threaded it. Seeing that these hold your wheels to the car, I would demand they pay for a new hub; I certainly wouldn't settle for something that has been chased or re-threaded.
Sorry about the chemical extingiusher...nasty stuff. There are a number of places to order a halon unit; do a Google search. Most sanction bodies require at least 2.5 lbs, but it doesn't sound applicable. Expect to pay at least $150...
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