Changes direct debit date without permission

A few months ago i took out a dstv subscription for my parents and made arrangements that the amount due to debit with my own account i..e one combined amount of the 1st of each month.<br> this worked well for a couple of months, then all of a sudden this month, only my own amount went off on the 1st and theirs were deducted on the 12th.<br> I called the contact centre and wasted 25 minutes of my airtime and life on a contact centre agent who clearly knows nothing. In the end even pretending not to hear me, hanging up and not calling me back!<br> I never gave permission to dstv to split these accounts!<br> Call me before EOB today to confirm that this was fixed and that both accounts will again go off on the 1st of the month. <br> Please also provide me with feedback as to the terrible service provided to me on Saturday by your call centre.