Kentucky fried complaint

On the 28th of March 2021, I tried to access a promotion that was advertised as one of their Sundays special named Sunday Family Feast for R 99.95. I had to order online in order to get this but when I tried to, this special was not reflected anywhere on their menu. I then decided to call their Alexandra road franchise to enquire how to go about making this order as they are the store I usually buy at and they are the store that delivers to my home. I called them 9 times and they did not pick up the phone. I decided to drive to the store so that they could help me place this order, upon arrival I was met by a guy named Siyanda at the door and I explained to him my problem, he also tried to make the order on my app but failed and referred me to a lady that she said was the manager by the name of Ntombo who was not helpful at all and she referred me to another lady and made a remark that "lo bhuti ufunwa jongwa ebusweni", this lady by the name of Zanemphi told me straight out that she does not know who online is and how it's done and whatever questions and problems I have, I must take it up with online. I was very angry to say the least because my family is expecting me to come home with K.F.C. I called their customer service department the following day and reported this matter and was told they would get back to me, I also made a note on their survey and they also said they would be in touch. It's been 11 days since and the only response from them was an email asking for my contact number which I provided so many times.