Sai Service Station — overcharging and bad service

Address:

Edapally,Kerala, Ernakulam, Kerala, 682025

I recently visited the sai service, edapally, ernakulam branch to rectify the front glass which they had not fixed properly. They then insisted the car needs maintenance and all oils had to be changed. I didn't realize that this would cost me in excess of rs.7000 including labour charges of 3000!! For just changing the oils and for a car like wagon r. The service team are just a bunch of deceptive people who are more of salesmen than service oriented. They also failed or deliberately didn't mention that it was done just six months earlier when my wife took the car for changing the glasses six months earlier.
They also suggested changing many parts but thankfully i didn't do it there fearing that they would bill me the price of another true value car!!. I further went to check if the part replacement suggested by them was really needed and they advised it was not necessary.