Rude agent, no customer care

This company bombarded me with SMSes asking for two different amounts to be paid in for my TV licence. I called the call centre to clarify. The employee asked for the reference number, which I had to repeat 3 x and then shouted at me that that was not the reference number. I explained the SMS stated that it was the reference number. She shouted it was a difference reference number to the one she wanted but it was the only one I had. When I said to her she could explain it normally to me and not shout, she put the phone down on me. I contacted "customer care" with a screengrab of the SMS and reference number and explained about the rude agent and the varying amounts, asking for a response. All I got was the curt reply below., no apology and no "customer care": "Good day Kindly note our telecom's team will assist further. Kind Regards, FAITH KHANYI, CUSTOMER CARE"