Flipkart — Received Parle G biscuit instead of ordered products and they not taking return

Order id - od[protected] eponymous romantic sky star master night light projector
seller: jainmasthmi

i ordered on 4th nov. Received on 12th november and found parle g biscuit packet instead of ordered item. Delivery person told to call to customer care which i did and they assure the refund and placed return from their end. After two days person came for pickup and he informed that he will not take it back as it has biscuit. I again call to customer they again assure the refund. This happen three times. Every time customer care generate return of item but person not coming for pickup and cancel the return from his end. Today call to customer care and informed the issue they again forward return from their end and assure return by 18th nov. Now again agent has cancelled return. Now what should i do?