Service cost kills

I have vento diesel and iam using since 5 years all I want to say is the quality comfort and drive of the car is Excellent, just the disappointment comes when we service the car due to its service cost and cost of the spares compared to skoda. One thing is clear that Volkswagen is maker of skoda parts and engine so why this two companies skoda and Volkswagen rates are different in service stations. As compare skoda parts are cheaper but all parts of skoda are with Mark of Volkswagen. The each cost of service of Volkswagen is around 13500/- and the same with skoda goes to 9500/- and even all spares of Volkswagen are 1.5 times costlier than parts of skoda.