UNAUTHORISED DEBIT ORDER

Multichoice deducted R1161.17 from my account. We changed our package earlier in the year to just the Easy View. We cancelled the Extra View and all the other bells and whistles. The monthly premium was then R29.00 but paid the full annual fee instead. Previoulsy they deducted our showmax subscription also incorrectly when we were on premium package. This was rectified and they credited our account. We also cancelled our Showmax subscrption. I have checked the May 2018 Statement which reflects the correct annual premium and no amounts outstanding. So who gave them the authorisation for this debit order and why this amount seen that our annual Easy View subscription is paid???? Their so called on-line Self Help didn't help at all. As usual Multichoice does what they want, even when it is *********.