Swiggy — unnecessary cancellation fee

Address:

Coimbatore, Tamil Nadu, 641046

My order number #[protected]

I ordered list of items and some items are not available in the hotel. One swiggy employee called and told that item is not available and he told he would cancel the order, the amount would be refunded and told me to order again. So i said ok.
But cancellation amount rs 75 is subtracted from the refund amount.
Now what is my mistake in this order in swiggy. The item shows available so that i ordered, why cancellation amount for me.
It is not my mistake and swiggy is responsible for this. I want refund the full amount.
Simply zomato employee eats customer's food, but swiggy eats customer's money.