Are your installers incented to do the maximum number of jobs, versus getting an installation right?
Are your phone reps capable of communicating with techs in the field?
Are they incented to fix your problem, versus getting you off the phone and handling the maximum number of calls?
Do they even have the authority, in most cases, to resolve issues?
If the answer to ANY of these questions is no (and, as it happens, the answer to ALL of them is no) then anything you say about your commitment is customer service is irrelevant.