Lapinoz Pizza — Cancel order

I ordered food from lapinoz pizza but the delivery was late and he told me to pay extra 200 rs for delivery so I told them to cancel my order
but they told me that I have to cancel from the app itself,
but the thing is that app doesn't have any cancel option.
so right now I have paid 308 rs to lapinoz pizza for the food I didn't recieved
Please help me out with it.