Debit order date incorrect

The only way I can get Vodacom to assist me is if I leave a poor review on Hello Peter. The debit order date for my account was agreed to be for the last day of the month, however, this month, my account was debited on 29/07/2022. I need this changed as I only get paid on the last day of the month. So if my debit order date needs to move to the 1st of each month, I need that changed please.