Burger King complaint: Customer service

My wife got on line got a code to get two whoppers, two chicken sandwiches and two 8 piece chicken nuggets, for 22 dollars. I gave the code 4 times to the new guy that was training. The manager asked for patience because he was new. I explained no problem. She then asked me to come to the window, so the manager could help me. I proceeded to the window, gave her the code and another one my wife sent incase it didn’t work. After the Manager tried codes, nothing was working. She then claimed because my wife got the code on her phone that they needed her phone for the code to work. I said maybe you should put a sign up that states the phone has to be on the premises for the code to work, because I had no idea. The manager then called me fking retarded. Obviously she was very rude with me. I told her all I want to do is order what my wife and children wanted. I have a special needs child and I was appalled at her reference to retarded people instead of special needs. I left the property still wanting Burger King food. My family loves it, so I went to another store miles away and had my wife send me an updated code for this store. They explained that the app was not working today so they asked what I wanted and I explained the order and they were extremely helpful and placed the order. Completely different and much more professionally handled although the code was still not working. I talked with the manager at the 44th street, Grandville Burger King and explained the situation to him that I had encountered at the Hudsonville location and he advised me to contact corporate. I just am still shocked. Never in my life have I heard someone use language like this to a customer and to call someone a fking retard is unacceptable by anyone especially a manager. I want to know what Burger King is going to do about this situation or do i need to take further steps? The incident happened at the 32nd Street, Hudsonville Michigan location at approximately 6pm on July 23.
Sincerely [email protected]