KFC's Unfulfilled Promises: A Frustrating Discount Code Experience

Hello. After dining at a KFC restaurant, I completed the survey on their website using the code printed on the receipt. I wasn't pleased with the meal at all. They mentioned that upon survey completion, a discount code would be sent to my email within 2 days. I don't understand why they can't provide the code instantly like Burger King or Popeyes; it's nonsensical. Regardless, after 2 days, 5 days, 1 week, and 2 weeks passed, I still hadn't received the code. I reached out to them via email and their website, reporting the issue in two separate messages. Unfortunately, I received no responses, neither positive nor negative. My concern isn't just about the discount code, but about not being taken seriously and feeling foolish for expecting the promised code. Another 2-3 weeks passed, and today I finally received an email with the code. I'm attaching the image for you to see. However, when I tried the code, no discount was applied. The app kept saying it was an invalid code. That's why I don't recommend the KFC brand; they don't keep their promises in any way.