You can always get it cheaper

It is interesting to be called in by a homeowner to fix something that was recently built, installed, or "fixed".  Just because a person has a truck and a toolbox does not mean they have the competence or integrity to do a job right.  There are innumerable ways to lower the price of a job, some legitimate, most are short-cuts that hurt the overall quality of a job.  Next time you need any job done, ask yourself if it is worth paying to have it done right by a competent, licensed professional.