The return policy is decided by the business side. The policy option is not decided by the Flipkart. The policy is decided by the vendor. Whenever you place the order, you should check the policies -
1. Return and Refund policy.
2. Replacement policy.
These policies are decided by the customer who sells own product on Flipkart.
You can check the return and replacement policy on Flipkart. Let's understand with an example - If I want to buy Samsung Galaxy A50 (Blue, 64 GB) (4 GB RAM) mobile phone on Flipkart and checks the details. The replacement and return policy will be here -

You should check the return or replacement policy first. There is 10 days replacement policy available. Click on the question mark or hover on it to see the more details about replacement and return policy on Flipkart.