TTK Prestige pvt ltd - defective Gas Stove product

I bought an PRESTIGE TTK LPG GAS STOVE,GLASS TOP-MODEL -GTJ-**, from AMAZON. in Octomber ****. After about ** DAYS, it Gas burner flame not working properly MY cooking Pots became blackish through All Three Burner . I make Complient More than three times, your servicemans three time visit and not yet solved the problem so I not further repair or servicing. Now I want to replace this defective gas stove product or refund My amount. Since It has a guarantee of ** years. Hence I bring this situation to your attention as you have good reputation in Indian markets. I believe I would get a quick response from you and get it replaced through the local dealer. Otherwise I unfeel to go Consumer Court against Company.I have enclosed the copies of cash memo Thank you in advance.