Ajio Reliance Trend - Wrong parcel delivered and now not refunding it

Recently I order a mid rise black jeans of VILLAIN company from the official AJIO app on *th may ****. I received the parcel from the delivery person on *th may **** which was not packed in the official ajio packaging and my bill was pasted on a previous bill which can clearly see through my bill and it was containing a low quality formal black pants instead of my order so I request for the return of that product later the delivery person came to pick it up but when it was verifying the product it doesn't pass the quality check because it was not the same product which was being ordered but I received it in the same condition I payed ****rs for that order and I want it to be returned and get my refund ASAP.