Swiggy — refund of order id [protected]

Address:	560076
Website:	Swiggy

The delivery person came to my building and by the time I received the order, Swiggy cancelled my order and charged my Is.75 for it. Why would I cancel an order if the person came to my door already.
They are not even responding back to me and just repeating the same thing. I order regularly from them and why would I cancel an order when it has reached my door.
They are duping their customers.like this. I will not using Swiggy anymore, but kindly take an action on them, they are taking 75 rupees from their customers by themselves cancelling the order.