Royal Enfield — rear chain sprocket teeth broken

My re bike rear chain sprocket teeth broken in just 1 year from date of sale and i've travelled around 10k km. I am using chain cleanser and lubricant for every 300km. Few of my friends who bought re classic 350 along with me also facing the same issue
Re producing such cheap quality products. Totally waste of money for this brand, it is too much disappointing to buy such cheap product for higher cost