I received product and paid 994, I didn’t ordered that product, I want to return that product but don’t know where to return

I received product and paid 994, I didn’t ordered that product, I want to return that product but don’t know where to return
I ordered from Flipkart a product of 994, I was in office when the delivery man called from my PG and said that order came from Flipkart and I need to pay 994, he sent me QR and I paid, instead of Flipkart order there was unstiched cloth peice, I Complained to Flipkart about this, today only they confirmed that this parcel is not send from there side, I want to return this, plz help me regarding this.

I received product and paid 994, I didn’t ordered that product, I want to return that product but don’t know where to return