Dstv pricelock

Im literally at wits end now with this pricelock. Firstly i didnt qualify and then after several attemps to tell the lady i allready have a decoder she sends me a new one which must be installed at own cost and then when you try and cancel or communicate about this dstv can only send them an email but they behind and so my account is running highly and yet again no one can help me. I just want to cancel it all even if i have to pay a fee as this is totally unacceptable after phoning every month. The decoder is not even opened