Xiaomi India — refund delay

Address:

vill bhathandi po dholi ps sakra, Muzaffarpur, Bihar, 843105

Sir actually i purchase a brand new phone mi a3 on 29 aug 2019 by mi.com with exchange but when delivery boy of ekart logistics come they say ur phone is not eligible for exhange so i request him to cancel my order and initiate refund on 2 sep 2019, but now the ekart logistics taking to much time to return the product to warehouse so i don't get my money back easily