Wrongful debits

I have an issue. When i received my discovery card, the telephone operator had asked if the minimum amount of R500 should be debited from my account into the discovery card and i agreed.<br> then the next two months nothing was debited and i had to manually transfer money into my discovery card as i had figured maybe the telephone operator may have slipped but i was not angry.<br> now this month, they have gone and decided to debit my account after 2 months of not doing so and have created a bad name with my credit payments and credit score. not to sound rude but i want this fixed and i want it done asap. they cannot decide to not debit my account for 2 months and suddenly do it when they want. I want this rectified please and while they are at it i want the debit order cancelled and i will do the transfers manually. i have statements to prove that they did not debit my account until this month. <br>