We are pool company in Riverside, Ca. A property management company hired us to work at one of their clients home. We have signed estimates and emails approving all the work that we did. They are refusing to pay. We started the work on 1/9/19 and finished on 1/10/19. We did not send the Preliminary notice. Please advise us of our rights? Should we go to small claims court? Who do we take to court? We have only had communication with the property management company. The house is currently up for sale.