Swiggy — 1 item was missing from the order but still no help from swiggy

I ordered food through your swiggy from singla's sweets on 18th august. When checked the order 1 item was missing from it and i had told the delivery boy but instead of helping the issue he already declared that the order was delivered without listening the issue properly. He said to contact swiggy executive but no help from there also. And he taken full money from us neither the missing item was delivered nor the money. When contacted to the executive there was no support. Totally disappointed from this and never ever gonna us this app.