Very bad service (multichoice)

My decoder stopped working at the mid month ofJanuary this year and I received another from my aunt. I called multi choice and they said that a change of ownership should be done in order for me to use that decoder. I did everything as requested and the agents still could not help me. I supp**** the necessary documents and failed with these guys. At that specific time my service was still on,I could still veiw. Due to the decoder I couldn't. Two weeks ago I bought a new decoder and queried my account,they claim I owe them R410? I paid R200 last Friday and called in then they activated my account. I also asked about the outstanding amount of R410 and the agent said there was a billing mistake and I still have R95 credit. Since Friday we viewed and suddenly this morning it was off again???? This incompetence are most irritating. This is ****************.