Consumer Redressal

I have purchased one jacket from myntra which was not appropriate with size , so i returend it back, in between myntra changes their recieving address, i got my parcel back and this happen twice, in between myntra people close my retuen request, again i called them back and generate fresh request and then before sending the parcel i have informed them clearly that i don't have bill and price tage along the product but product is unused, their cc agent informed that no issue mam you can send without those deatils , i send the product thrice and after two months after locking and calling their agents for help, they replied me that sorry we will not refund your money as it does not contain price tag, this is the complete case making customer fool. i need appropriate action against them , my registred email id with myntra is sohalmandeep29@gmail.com. Please help with corrective actions