Poor customer service

The customer service that is offered by dstv its a shamble & a great insult to us as customers.. . I can not believe that I have been billed incorrectly & when I informed the agent sifiso. He adviced its a system error & dnt know it will be fixed when.. He has refused to get me a manager as I have asked many times & had to argue for more then 10 minutes in order to have him agree to get me his manager .. To make it worse I have been placed on hold for 7 minutes to be told I will be called by a manager kagiso & I have stil received no call to resolve this issue that I have been Billed wrong..