Flipkart — Received wrong product and delay in return

I have ordered a rare rabbit shirt by flipkart pay later option on their mobile application whose bill will be generated 5th of every month. The shirt is supposed to pick up by 4th oct but today they have canceled by return my their own n now i have to pay the amount of product in my bill cycle that is 5th of oct n now i have again a return request n after having a conversation with their executive i had been told to pay the amount in my bill n they will return it after recieving the product later. Its so hummiliating