Flipkart — Product is not refunding by Flipkart wishmaster.

On 3rd March, 2021 I ordered a Casio Edifice EX488 ( EQS-920DB-1BVUDF ) Worth Rs. 11, 995/- When I got the product (5th March, 2021) I got different model of Casio watch. Then within 10 minutes, I contacted Flipkart and told the whole situation. They told me to refund the product. Then I do the same With mentioning the reason that "Got different product as shown from the website" As told by the flipkart. But when wishmaster came to me they refused to take the product as the product don't match with the image shown on the website. I tried much but he didn't even tried to understand me and denied my request. And after sometimes I got that my refund request is cancelled automatically.
Now, tell me what's my fault here. If I have highlighted that my product didn't match the product I was ordered and that's why I am trying to return it. But the wishmaster is not taking my product saying the same thing that the product didn't matches with the image of the website.
I am very depressed and mentally harassed. What my fault here? That I believed Flipkart and bought the product which clearly mentioned the return policy of 30 days. But Flipkart is not helping me. Everytime when I contact Flipkart they say the same thing that you will get a resolution within 48 hours. And the same thing is happening again and again. Please help me I am in trouble 😭😭🙏🏻🙏🏻.
Please Flipkart, It's my humble request to give me the refund of my product. I have everything which I got with my product. Help me please!! I can't do the same thing for whole one month.
Hope you will check my issue as soon as possible. For this I will be grateful of yours.
Thank You!