Adidas — Refund problem

This is regarding order #AIN02875906
I placed an order on 25/03/2023 for a pair of shoes and I returned because of its bad quality. The payment was made via cash on delivery mode. The personnel received the product on 01/04/2023 and I got a mail stating that refund has been initiated, however they did not ask me for my bank details.The customer support lines are always engaged and I did not get any response to my emails. The value of the returned product was ₹2141.57 rs.