Godrej Interio — Modular kitchen complaint

Company gave me 15 year warranty on rusting as mentioned in the bill. My kitchen got rusted in 5 years and when i claimed replacement then they clearly denied. What kind of service they have? Why they gave 15 years warranty then? Is godrej really concerned about their customers?
Its been more than 6 months from the date of complaint and no resolution has been given till date.