Mirraw Online Services — Return of goods not accepted and poor quality of goods

Dear Sir/Madam,
Date of incident: 16.12.2022
Order Number: M[protected]
Description: The received goods were of very poor quality. So we initiated the return within 72 hours (with tracking number of shipment). We notified Mirraw and they acknowledged the return request. I gave them the tracking number of overseas courier. They promised in their email that Mirraw will pay the customs duty charges and then deduct it from refund.
But on 16.12.2022, Mirraw warehouse team refused to take the parcel from India Post and they are asking the Sender (me) to coordinate with Post and pay the customs charges myself. I was ready for this but the India Post does not have such provisioning. They said that receiver pays the duty and claim it fro sender (for this - I already agreed with Mirraw to deduct from my refund). I am calling and emailing them since 17.12.2022 to follow up on this matter. But I get poor response. They said they will deduct 55 Euros as customs duty (without them receiving the package).
Post office is now preparing to return the packet to me again (for which I have to pay again the fees for returned parcel to sender). This is very sad and it is causing so much of agony.
I am struggling to get my refund on returned goods. I have initiated the return of goods within the rules that Mirraw defined.