Flipkart — wrong product shipment

Address:

Ahmedabad, Gujarat, 382424

I had ordered a mattress on 15th july (Od[protected] which was delivered on 26th july. However the recieved product had different size than the one i ordered. I had requested refund immediately and when cantacted seller, he also confirmed that there’s been a mistake in the product they delivered. Since then my request gets cancelled and i have to make another request. Tomorrow is last day of return policy after that i will not be able to make any such request. Flipkart needs to take things seriously, i request this complaint forum to take required steps and help me sort this problem out as soon as possible. Thank you.