Debit order deduction dates

In may 2022 I took a cellphone and data simcard on contract at Goldfields Mall Telkom store, Welkom. Due to change of employment, in September or so 2022,I spoke to Goldfields mall store, Waterfront store (Bloemfontein) about debit order dates of which I was reassured it is updated on the system. However Telkom kept to the 05 date of new month when I had requested 25th of every month. In 2023 I made arrangements again and again at Waterfront branch and on their national call lines. Now my credit rating has taken a knock badly this month because Telkom didn't deduct from me in December they waited for January 5th again. Knowing very well that if there is no payment on the 5th they arw going to charge me over R300 for a failed debit order. Now my bond pre-approvals failed. I only became aware recently that my credit score dropped because telkom happened AGAIN. A cellphone cost me an opportunity to finance a home for my kids thanks to Telkom