Flipkart — the product is returned but flipkart has not refunded back the money.

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

I bought a towel set from flipkart whose order id is "od[protected]" which i returned back on 25th may due to poor quality and the product was not the same as displayed in the image on flipkart, i handed over the product to the courier service boy but he did not give me any sort of receipt. All of this happened in front of my company.
I have multiple times asked flipkart to refund my money but they denied about any pick up of the product. I even have the message from flipkart when the courier boy came to pick my product. Flipkart customer executives are very rude to me saying that you can yourself go to the courier service to inquire about all this.
Please help as i neither have the product nor my money.

Tanu sharma
[protected]