Yes, the law is that you dont pay, you document the flaws with an inspector, then if need be you go to small claims court or negotiate a settlement. You can wire a whole house for his labor charge.
How much wire, what size? You dont pay for WRONG work by dopes. And you dont fry ANY pump because you test voltage at start up FIRST.
Times are hard. Contractors are starving, lots of people getting fleeced.