Worst customer service behaviour

I called your call centre this morning. After waiting for about 10 minutes I eventually got through to an agent who took my details and said she will put me through to the correct department for my query. I held on the line yet again for another 20 minutes and I got through to Tshepo or Matshepo who pretended not to hear me. I kept on saying hello hello hello after about 3 minutes of that I could hear them placing the headsets down and mutung the call. I stayed on the line and when they returned and I was still here they continued saying thank you for calling Nedbank and eventually dropped the call. Your agents behaviour is absolutely horrible and I really hope you get this sorted out. We don't call the bank out of boredom.