Frustrated customer

My services are disconnected again whereas I made a R500 payment. They reconnected my services I was promised that this matter is sorted but here again. I'm told I owe R614.34. I have been indicating numerously that my old decoder is in storage. I'm currently using a new decoder. I spoke to Getty who advised me that she will cancel subscription on the old decoder and activate decoder #######886 only. She reconnected the services and told me that the R500 I paid will be credited to decoder #######886. So why am I owing R1111.77. Why do you always rush to disconnect our services and add the reconnection fee. Can you please solve this matter urgently as I have wasted alot of time and money calling and chatting but the issue is not being resolved