Swiggy — They are charging 50% tax

Hello,
My name is sahib singh, resident of new sunny enclave, sector 125, mohali.
I was trying to place an order on swiggy today from a restaurant called superdonuts in mohali (Airport road).
While placing the order for four donuts. The total amount for my order was ₹339.04 plus a delivery charge of ₹15-20 and a discount of ₹33.
After this they were charging me ₹152.58 as tax gst. I have attached images for the same. I received the same order from zomato at a very low amount. Just wanted to send my query as these guys are looting the money in name fo gst and discounts.