Bad call centre service

Bad service from their customer care consultant Thato Tau and her supervisor Anthony Phora whom I spoke to in January 2019, the call centre agent was very rude to me and shouting at me on the phone, I spoke to her supervisor Anthony Phora whom said that he will listen to the call and call me back to update me on my complaint, but to this day he has never communicated with me nor responded to my emails. The agent gave me a very bad attitude and service and I will not let this go without exhausting all resources available to me,