Unfairly treated

My Multichoice debit was supposed to go through on the 25th of february but they did not debit,and my decorder on ID number *** was disconnected ,I then went and made a payment at pep store.I called in at multichoice on the 31st for a reconnection when i asked the consultant as to why they did not debit she told me that on the systerm it shows that the debit had been cancelled,but i had never cancell it,now today on the 11th of february my decorder got disconnected again,when i call in to ask they told me that im owing them R120 for reconnection fee becouse i have two decorders on one account and they do not want to reconnect my decoder,but im failing to understand them as they are the one who **** a mistake of not debiting and their consultant telling me that it was cancelled while i did not cancell anything.please assist me