No help from DSTV

I have been a subscriber to the premium bouquet for over 30 years. I am now a pensioner so I decided to downgrade my bouquet because myself and my wife travel more. Now when I decide to watch dstv there are errors codes and I have been call multichoice and installers but they play the blame game. I even tool my decoder to the multichoice offices and they told me that there is nothing wrong with my decoder. My dstv premium fluctuate im being charged for things which I didn't request . Please assist me because I'm getting myself into debt holding the line for hours and exhausting mu phone bill. I cant watch anything because they can't fix the error its been 2 weeks and dstv will still charge me for the whole month even though there is an error. Please assit me