That sucks, but this is the exact reason I don't take cash up front for my jobs with electrical work. If you have no money invested you have no right to bitch about how much time it takes . I get them done quick, but sometimes life kicks you in the butt and jobs take a few weeks longer than expected. No way jobs should take months longer than expected though, but I guess it's no different than all these shady house contractors out there taking the money up front for the jobs then doing shotty work or no work at all.

If it's done right the shop doing the job will give you a written estimate that you agree to and sign. This way if you don't pay up when the job is done he puts a lien on the car and sues you for the balance since you are now obligated to pay.

Also, If the guy is not insured your going to have fun collecting from him.

All in all the guy is a douche for not at least following up with you guys on your cars. Good luck getting the job done or your money back!