Probably a question for John or someone who can help out a fellow GZ

I have enrolled authority to direct debit from my card on my account and Vodafone confirmed having processed this on the 9th Feb. Bill due dates are on 18th of the month. I understood this was all set and I didn't have to log on to my account to pay off the balance each month.

I just received my March invoice and there is now a line item charge of $15 + GST for a late payment fee. But hang on, Vodafone has the authority to take funds out of my card already.

I'll provide account details for investigation. Tried the call centre and it has been 15 mis of reggae music and my ears started to bleed