Billing incompetence

I have a credit card with Nedbank. It has occurred twice now that your debit date falls over a weekend. Each time, you do not take your money and then advise that the fault is mine, for not having funds in my account. There were, in fact, funds in the account on both occasions.

I have emailed through my bank statement to this effect eleven days ago, with no response.

I object to being inconvenienced, harassed by your call centre, and charged penalties because of your incompetence.

Please rectify - including removing these incorrect penalties.