Myntra.com — Refund calculation is incorrect and not fair

I ordered 6 items from myntra on 14th June 2023. I was expecting those to be received on 16th June but I got it on 19th June. Hence, I was trying to return all the items as I didn't need it after 16th June. I paid in total 3198 rupees as there was instant discount on the OneCard above 3500. So, I got instant discount of 436 rupees. Please note that 3198 is the amount I paid in total. I have also attached the screenshot of the same. Now, when I am trying to return the item, they are giving me 500-700 in total and saying that OneCard discount is applied and OneCard discount is appliable only on payments above 3500. But, I have paid total 3198 and I am not even opened the products. Its seal packed as it is and I am only getting 700 back. So, I want myntra to give me complete refund of the amount I paid and collect the package.