Inferior servicing of a premium vehicle

I own a W205 Mercedes Benz C Class C250 and had my vehicle serviced at 30174km. At 31922, a "Check vehicle pad wear" warning light appears on my dash. Part of the service is to check brakes according to the service book. I was told by the service department at Century City Orbit that they will only attend to brakes if the warning light comes on? I have had Mercedes products for the last 18 years and never experienced this type of issue. I am leaving for a tour consisting of approximately 5000km and this would have been a problem if the warning light came up on my tour. The rear pads has been replaced without replacing or skimming of the disks. Has MBSA stooped to such low levels in the servicing of their vehicles or do you have a reasonable explanation why you have such a practice?