Did you have a contract in place that stipulated what would happen in terms of a legal dispute? Did you pay in cash vs checks? First you need to prove that you were harmed in the process, in California it’s preponderance of the evidence which means something did happen more likely than not. So that means can you prove harm with pictures? Contract being broken? Work not being completed what?
So I’d argue in court that because said work wasn’t done and here’s the proof I need to pay an additional x amount of dollars to get it fixed and this much time…good luck.