a laborer files a mechanic's lien on our property but they did shoddy work. we documented everything and are not paying it off, have a very strong case to sue for damages and incompetencies. Their attorney contacted us and is willing to remove the lien if we sign a contract that we won't sue them or report them to any government agencies. we live in CA and the lien expires today. should we sign it or let it expire and then submit a demand to remove? any advantage to either?