Apple India — Not repair in warranty

My MacBook's keyboard's delete button was not working properly so I brought my MacBook to the Apple Store, then he said that your MacBook have a little or minute dent on your MacBook, then you cost 25000 rupees.they denied to repair in warranty tell me what is the connection between delete button or dent .why you give the warranty of 12 month when you are not able to repair in warranty.my parents very hard working then they earn money not like you cheater apple