Swiggy — missing order

I ordered food items in coimbatore. Order no [protected]. I received only the main items. The side dish totally missing. I asked the deliveryman he told ' my work is
delivery only. Then i asked to the restaurant they told he only missed the side dish parcel. Then i personally went to the restaurant and picked up the parcel. In restaurant they did not close the order and blamed the delivery man only. If it is going like this then what is the necessary to order in your app