DSTV is double charging me

I have premium channels with DSTV for which I must pay R808.50 but MULTICHOICE is charging me twice that amount monthly and it cost me to have to call every month and rectify that mistake which they have to reverse the money but the same thing happens the following month, they keep saying it their fault but they can't fix it, I have extra view not two separate accounts, I'm tired of paying for airtime calling MULTICHOICE and paying reversal fees it unfair !!!?????????????????