If the dealer of my brother's car did not install the security system that was paid for and the car got stolen, is it 100% liable?

Question Details:

We were thinking that they should compensate for the value of the property stolen since they neglected to install the system. That means they should replace the car or give us similar or equivalent value for it. Can we demand this? I think there is still negligence on the part of the dealer. What are our options?

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