B0 Service at 70k miles

My new to me '14 GLK350 is due for B0 service. I live in the SF Bay Area and called Stevens Creek MZB in San Jose and got a phone quote of "$750 to $1750, depending on what they do" and a description of "oil change, cabin air filter, brake flush and maybe a transmission flush and other stuff". I was transferred to a service associate who didn't answer and never called me back. Needless to say I was a bit non-plussed with those guys after spending a half hour on hold. Who are the best dealers and MZB shops in this area? I had a great mechanic for my 450 SL but he retired.