CHARGE FOR FREE SERVICE

I am subscribed to DSTV for premium package and to my understanding showmax is for free for premium package subscribers. To my surprise on the 30th of November 2017 I received a debit order for my DSTV subscriptions with an amount which was more by R495, when I called in to enquire they informed me that it was for showmax subscriptions which means in one month I was billed for 5 months worth of subscriptions(R99 x 5 =R495). This amount has already been billed and means it will go off on my next debit order. Multichoice called me and assured me they would rectify the issue as it was an error on their side only to be called later and informed that I have to call showmax and rectify the issue with them. I cannot be calling from department to department for an error that was not on my side. Please could you kindly reverse the wrongfully billed amount. DSTV customer number ********** 0