paying for a decoder that is no longer in use

I very unhappy, WITH THE SERTVICE I HAVE BEEN RECEIVING FROM MULTICHOICE BILLING ME FOR A DECORDER I NEVER USED FOR almost FOUR YEARs NOW I AM SO ANGRY RIGHT, how can I pay for something that has been made active, which I never ask for image a decoder laying in cupboard somewhere, I will not be paying the R 173 for the connection of this decoder that is not connected, is this the latest **** of DSTV you send a WhatsApp asking for an amount to pay they send an amount then all of a sudden after paying the amount and requesting for reconnection the suddenly there is another amount that pops up. this is not right what u are doing please give the correct information