Dstv premium subscriber but billed for showmax

For the past 5 months I'm trying to resolve this issue but all that they do is absolute nothing. I'm being billed for a service which I'm supposed to get for free. I'm fed up!!! Have now spend countless hours and a high telephone bill trying to resolve this issue but they just to *********** to resolve this issue. I'm now considering going the legal route as I'm being charged for showmax which I'm supposed to get for free. IT SEEMS THAT NOBODY AT DSTV CAN OR WANT TO SORT THIS ISSUE OUT.