Flipkart — Product not replaced for wrong size

I have ordered Springtek Amaze Eco matress from flipkart of size 5 X 6ft but the size delivered to me is more in length because of which it is not getting fit into my bed. I had raised the concern immediately to flipkart customer service after delivering the product (on 6th November 2020) but the delivery of the product was not marked as delivered in their system due to which they have not accepted my replacement request. I am continuously taking follow up from flipkart from 6th to 13th November and each time customer service was telling me that issue will get surely resolved and today on 14th November they are saying your replacement request has been closed which is not making any sense.
Please replace my product with required size only as soon as possible.
(Refer attachments for more details)