Adidas — No refund after I returned the products

Address:	Name: Nikhil Mahajan Designation: Digital Brand Commerce Director Address: Plot No. 53, Sector-32, Institutional Area, Gurugram, Haryana-122001, India
Website:	adidas.com

So i have ordered 2 products from Adidas and due to the reason it was very tight i opted to return one of the tshirt which i orderd and after a few days i failed to make the pick up on time so i emailed adidas and they said me to self ship the product to their address and i self shipped the product through DTDC courier service on 3rd october and after that i emailed once again after no response from adidas they instructed me to email them the courier slip and tracking id which i emailed them and even after this there was no response its been months and ive called and emailed them more than 10 times and everytime i get the same response from them... ive attached both my bill and courier slip down below
my order number is AIN01455620
MY TRACKING ID IS C26096490