Apple India — Defected ipad

I purchased ipad air 256 gb, its on off button was loose, after 2 replacements they didnt deliver good product, i ordered third replacement, but since 2 months neither apple giving refund not product, where will i go, my online classes are going on, my money 75000got stuck, i cant buy other talblet for my online classes, , , never expected this FRAUD FROM APPLE, , , i regret in choosing apple, , i must gone for other brand of tablets.
THESE FOREIGN BRANDS ARE THUGGING OUR COUNTRY