Zomato delivery guy

After showing me that the Zomato delivery guy has reached the place 15 mins ago, he wasn't calling me to tell me he has arrived. I tried to call, he was answering the call but not responding thrice. I got pissed at him, when I saw the phone there were texts from him on the app asking me to come out instead of calling without mentioning the reason. I went out mumbling why is he doing this way, only to face him and get to know that he's mute. It was my first experience to get a delivery from a mute guy, so I couldn't guess that could be the case. I apologized that I didn't see his texts earlier and gave a tip for the first time on zomato.