Zomato — missing items

Order number [protected].. I had ordered a combo which contained cold drink as well however i didn't receive any... When i tried to get in touch with the chat support they informed as i had received many credit they can't help me.. Now my question is who gave me the credit and why?? Did i asked for it or they gave me to to compensate their mistake. Now when again i am contacting them for a issue created by them why aren't they willing to help.. I tried calling the restaurant but unfortunately it was closed hence could not contact them and the delivery guy didn't had any cold drink for my parcel.. Who is responsible for the situation is it me?? Why am i denied help?? I paid online thinking that i will have my food without tnsn now who will give back my money which was taken as a cold drink was included.. It simply means they do this to steal money from the customer and to cheat them.. The credits they gave it was all for genuine reason not that i asked for.. If this is the way then i have to go to twitter facebook and instagram so that my friends and family along with their friends and family are aware of the cheapness from zomato.