Swiggy — no refund after missing items

Address:

bangalore, Bangalore, Karnataka, 560094

Swiggy missed items in my order and is now refusing to refund. They are profusely apologising but not refunding.

I ordered from subway through subway.
Order 1 foot long sandwich. And made it a combo with a drink. I never got a drink.
I asked the delivery guy why he didn't get it.
He told me that he didn't get those details from swiggy. And
Order number and details as attached.