Dstv incorrect debit!!

Earlier this month I used the dstv live chat option on the app, chatted with someone to confirm my price lock details... I was advised that every month I will be debited 1023.50, this morning I get up to a notification of payment for 1803.50... Again, I went to live chat and was advised that MULTICHOICE failed to debit the correct amount in February, so they double debited me this month... Nobody from multichoice contacted me in advance, and now they refuse to make payment arrangements, as if I failed to pay... They made a mistake, why was I not notified??... Why were arrangements not made??... Switch to Netflix guys!!