ATS Le Grandiose: Maintenance cost confusion

Did a site visit to ATS Le Grandiose Phase I last week. Kids have moved out, so I'm trying to downsize to a low-maintenance flat. But yaar, their quoted maintenance charges for a 3BHK are seriously high for a completed project. Brochure mein toh itna nahi bataya tha. Has anyone else felt misled on this? Matlab, itna kaise justify karein?