Worst customer service ever and trying to rip off ...

Worst customer service ever and trying to rip off people
I purchased in 2015 a new glk350 and took the 3 year prepaid maintenance package
Last week I went for my last prepaid maintenance and I asked how much it will be for my 50K maintenance (A3)
He checked on his computer and printed me the quote
$2273
Seriously? For an A service
You would definitely not get my business if you guys think that I can be taken advantage of.
Shame on you to come up with crazy numbers. Parts for what he recommended me cost maximum $200 so I recommend anyone to just go to a local car shop