Adidas — Refund of order AIN00406896 not received

I had ordered pants worth Rs.2500 from Adidas. I had to return it because of size issues. Since it was a COD order ( AIN[protected], I had to fill a form with my bank account details in order to get the refund. It’s been more than a week since I’ve returned the product and more than 3/4 days since my product has passed the quality check but I still haven’t received the refund form. Their contact number is always engaged. Previously, Adidas had a much better and quicker service.