Amazon India — refund issue for a cancelled product

Address:

201301

I ordered a mixer grinder on oct. 30 and it was supposed to be delivered by nov. 30 but it was never delivered to me. Then i cancelled the order and request ed for refund. Since i was not getting any appropriate option, i selected return and refund. Unfortunately, i did not get refund till date. I also called to customer care, he locked the ticket, and advised me to wait for 48 hours. But the issue has not resolved yet. I am fed up with contacting customer care again. Please suggest, if you can help on this.