Mahindra And Mahindra — regarding service cost

I brought an xuv300 from koncept mahindra sector 2 noida. I gave my vehicle for the second service which was at 12000 km approx. And they gave a pre-service bill of 6500 plus 18% gst. While mahindra claims a charge of[protected] for the second service. And they are recommending me to change multiple parts like ac filter, silencer filter, and some more and i am not a mechanic i don't know what is right or wrong. Either you should update your service price list. And one more thing just after 2 months of buying there was a problem with my car battery was not charging and it took 4-5 days to get fixed. I am really not happy with the experience. Thanks