Reliance Digital — I ordered 2 quantity of same product mistakenly and want to return one.

I got the two products so I want to return one of them.
When I ordered the first one, it showed "Payment Unsuccessful", so I tried again and after a few tries the order was successfully placed.

But after sometime I got a message that my order which was failed on the website, was also getting delivered to me.

It was night at that time so, I accepted both orders but opened only one.