Although I have been through many arguments over incompetency and to a degree illeteracy on the workshop staff front I have learned that you need to target the right people to get anything done and even then it is a struggle.
There was a time in the dim and distant past when the people working on the service desk had a knowledge of how a car was put together and what was required to keep it running but now it seems there are more administrators, so as not to offend the majority who fill such a role, who are more skilled at maintaining a database than a vehicle so there is no point at trying to get your point through to them as they are not required to have the knowledge of the points you are complaining about. Complaints of this nature need to be made directly to the service manager not to sales or front desk staff. Where the garages fall down now is that they have forgotten the meaning of service and many customers are more mechanically proficient than senior members of the workshop staff as they have been brought up with normal fault finding procedures i.e. no computers and will attempt to repair failed components rather than fitting a replacement because they do not know how to strip it. Point of note here is the my nine year old daughter commented that my wifes car was sounding funny, it has in intermittent misfire when hot, but no one at the dealership noticed it. The fault was investigated with nothing found, we then demonstarted the misfire so they then tried two other cars which both showed the same symptoms and embarrasingly enough one of the cars belonged to one of the technicians who had not noticed his car had the fault. We are now awaiting a resolution from Ford direct, so I guess we will be living with it for some time to come.
Sorry bout the rant,
S.