Incorrect Debit Date, with Double Debit - Account in Arrears

Case Number : ***9 sent on 10th April, requested the billing date to be changed from 25th to end of the month. However, that never occurred despite having requested that to be changed..

On the 25th, you billed the account, but I did not have money in my account, hence I changed that debit date in the first place. This incurred R110 bank charges on FNB account.

Yesterday, I called and asked my banking details to be changed to Capitec from FNB, and the debit date to be the end of the month - which the lady agreed to have effected that.

Now, today 30/04/2024, I am getting a message that my account is in areas with R954.78 - which is double billings that I don't understand. Karabo, the lady I spoke to said it's because Matrix (you) did not deactivate the old unit - hence double billing - she was putting me to a department that will assist, but spend more than 10 on the call, and it was dropped.

Question 1) What is going to pay the R110 charges incurred as a results you debiting my account on an incorrect date?

Question 2) Why am I being double debited, and why was the old unit not deactivated, incurring double billing on my account.

I need this double billing nonsense sorted, furnish me with correct invoice amount so that I can make manual payment to the account.