Tyre run out

good day

i took my car to HI-Q lydenburg for magwheel fitted i only drove the car for two weeks and last Friday the car left back wheel run out from the car while driving on the Sabie Road. i called the HI-Q manager, he arranged for car to be towed and fitted the original mag back, the car studs were broken, and my new mag wheel are damaged, the manager does not want to replace my mag wheel. and the say the problem was the nuts, whereas they are the one who instructed me to but those nuts from them, please asist me