Amazon India — No refund even after 40 days

Address:

India

I had returned the product with order Id[protected] on 11th December .
On 14 December I receive the cheque with incomplete name so I request a cancellation on the very day it’s 20th jan and till now nada .
Everytime I call up every executive asks for 4-5 days and again when the days are up they ask for more 4-5 days .
I have messages from the executive confirming the same .