Swiggy — incorrect/bad quality items delivered - refund not processed

Order id [protected].. Ordered food on 13th december night around 10.20pm, received incorrect food items and bad quality item, not able to eat the same. Contacted restaurant immediately, they didnt send fresh order, directly refused to send. Then started contacting swiggy, they didnt help at all, processed a coupon of some amount, as per refund policy if the order is not fulfilled then refund will be processed to the source, after so much harrasment not yet received refund, neither they released my current promo "order50" which has been used in this order.
They are clearly saying "they won't be able to give refund"