Bata India — Unable to returned product

ORDER NUMBER : BW[protected]

I've been trying to return a product bought from Bata online store (website) as it doesn't fits me well. And every time I try to returned it, the site generates an error (see the image).
I mailed them regarding the product replacement and even tried the customer care helpline number. But none of them have been able to solve this issue.

The product is withing the return policy of Bata. And they claimed to get it returned but the website is not reponding to the replacement query.
Kindly get my product returned and refund my money. Or send me a different size of the product.