Flipkart — Wrong product delivered and no resolution provided

I had ordered a Redmi Pad 6 GB RAM 128 GB ROM variant from Flipkart and paid ₹19, 999 for it. And on 24th June the delivery guy gave me the product, opened it and without showing me specifications or anything left in a hurry. When I booted up the Tablet and went through the specifications in the About Phone page of thr Settings menu, I noticed it showed 4GB RAM. I checked the product box and it also had 4gb RAM written on it. I had ordered 6 GB RAM variant but to my surprise I was delivered the wrong product. I have reached out to Flipkart since the day of delivery but there's absolutely nothing from their end to resolve the issue. Instead, they've told me to reach out to the seller (Redmi) by myself. Accordingly I went to the nearest Authorised Mi Service Centre and they've forwarded the issue to their superiors (their reply is still awaited).

Now Flipkart has neither resolved the issue nor have they provided me with any positive assistance. They're pretending nothing has happened and are delaying the resolution till 1st July which is the date on which the return policy will expire.
Kindly, resolve the issue I am tired and frustrated by the lack of action from both Flipkart and Mi Support.