Hyundai Motor India — services from showroom

Address: 530041

I received call from your mango hyundai (Pm palem) showroom stating that bring my vehicle which is having free 3rd service and she told that it will cost 2700+ taxes but after 2 days when i gave my vehicle they charged for 5400 (Approx), one of my friends is having i10 they paid 6200 for paid service but i paid 5400 for free service... I didn't find any logic in there and i'm completely unhappy...