They take money for their own mustakes. Review on Swiggy

I ordered from swiggy in Mussorie where it was showing available items n I paid 752 rupees for it. In 5-10 mins I recieved a computer generated call from swiggy saying items you ordered are not available please go to help section to choose alternate items. I called on swiggie's number n agent told me that I need to cancel this order.. The moment I cancel it, they charged me 227 for cancelation. I thought what the f is this. Then he replied that your order was for 550 some rupees and rest is cancelation for previous order.. Same thing happened where agent was unable to deliver my order n I have to rebook it from my wives phone. I do not understand how someone can charge for their own mistakes!! I do not recommend swiggy to anyone. Restuarants are fedup of them due to price cut n consumers too... They give advantage to us but at the same time this type of issues are also there.