Adidas — Bad customer care service and no refund policy

I ordered 2 pair of shoes recently but had to return them due to size issues.. the order was picked up 5 days ago, it was COD and i paid it via upi of my delivery partners account as there was some problem in QR scanning.. i received an email saying my return has been processed and it has been refunded to the bank account through which i paid but as far as i knew for COD order they are supposed to take bank details and then transfer money to them... I can't just around and let go of money worth rs 7900...the customer service is also unavailable and they always give the same automated response on email