Very angry customer!!!

I've never been this disrespected by Xolani the 'manager' of Burger King Midlands Liberty Mall. I placed an order of two burgers(triple spicy burger and triple cheese burger), when my order came I was disappointed because the burgers were dry and tasteless(if there's such a word). I called in to complain and the phone was answered by a very disrespectful Xolani who didn't greet and ask what I was calling in for, I had to greet and ask for his name. As I was telling him about my complaint, he was talking on top of me and not allowing me to finish and cut me short by telling me he will get back to me in 5 minutes because he had to report this to his manager. I waited and waited and decided to call back because no one got back to me. Whenever I called the phone was being disconnected. I tried again and Xolani got back to the phone and told me his manager said he can't assist. I asked to speak to the manager but Xolani hung up. I called again and Xolani came back to the line, I asked to speak to his manager and he told me he was the manager and he won't assist me. I had to order elsewhere because those burgers(Burger King Midland Liberty Mall) were dry and disgusting. The staff is very disrespectful and don't take their jobs serious and don't care about good customer service. I need for them to be dealt with because I'm sure they're used to doing this to customers and getting away with it!