Flipkart — Complaint for return issue

Dear sir/mam
I want to say that I have ordered one black and one blue jeans of ₹701 each. But by mistake I received two blue jeans and two black jeans and I also paid for that.

I don't like the quality of jeans so i returned them but only 2 jeans were returned. The extra two jeans are with me which I also want to return but as these jeans are delivered by mistake, it is not shown in my Flipkart account but I don't want them. I want to return them.

Below is the attached bill of those extra items which I didn't order but received by mistake and also paid for them.

Please guide me how I can return them.

Thank you
Surinder Pal