Can I sue an unlicensed contractor (california) for my insurance deductible after his worker caused water damage?

Hired a guy who advertised on social media to install a home security camera system. He brought a second guy to help him. His friend stepped on a sprinkler pipe. Causing $12000 water damage. Contractor initially agrred to pay deductible. He finished the job but work was terrible. We didnt pay him for his work considering the damage caused. They provided $200 towards deductible but now are not taking our calls and via email have informed us that he will not pay and will no longer do 'free' work to finish the neglegent job they did in the first place. One camera (we purchased the system) was damaged in the rain because they didnt put the weather proof casing on the wire. All we want is the remaining cost of our insurance deductible which is $800 and the cost of the damaged camera.