Apple India — apple watch 4 complaint

Address: 682020

Dear Sir.
I purchased an apple watch series4 lte on feb 2019 after 2 months its start body color complaint . Color gone and dots coming on the body due to sweat . Its quite natural when wear the watch on hand sweat will there . I submit the watch apple service center but they tell its not cover warranty . Why apple sale this type cheap quality product . Kindly chak and do the needfull to get solution