Can't provide quote for minor service

Phoned to get a quote for a minor service but they seem like the only place that can't give you a price. Surely they should know what a minor service on a specific vehicle will cost because any additional repairs is always an add on. Took my car there for the 6 years it was under a maintenance plan then it was all honky dory. They obviously don't care about existing customers... Lucky with the new law we won't be forced any more to make use of the specific car's garages!