Wonderchef Home Appliances — defective piece delivered

Ordered a turbo chopper and grater on 22.11.18. Received it on 25.11.18 but in defective condition. Complained and received the mail that my complaint has been registered. But still not received the exchange for the defective piece. My complaint number is wc/bt/241118/127. When enquired about my status i was told that my exchange has been approved and will be receiving a mail. But still not received a mail nor any action has been taken. Kindly look into the matter and help me receive the exchange.