Kurl-On — Mattress has sagged

Address: Bangalore, Karnataka, 560042

I had purchased mattress on 15/12/2014. I had lodged complaint on 10/02/2016 vide complaint no. Tn99062. I came to know that my complaint has been approved for replacement. But till now i have not received replacement. Every time i call customer care they say same thing as follows
"your complant has been approved for replacement but we dont know why replacenment is not done i have mailed the manger and we will call back"
This same thing they say every time.