didn’t get raitha with biryani

Food tasted amazing. Everyone at the office meeting loved their meal. However, we did not receive the Veg Shashlik Kebab with Pineapple entree which was on my emailed receipt and we had paid for it. When I called the restaurant they told me they had tried to notify me that they were out of that dish but I did not answer my phone. I checked my phone record and I had not missed any calls on my phone that entire day. The restaurant said that I could take a screen shot of the email receipt and bring it in the next time I ate there to get a complimentary dish. Not the best way to handle their mistake in my opinion.