Failed Debit Order Update

MTN needed to change my debit order from one bank to a new bank. I made the request via email on 30 May 2023. I provided my security details, the letter from the bank and the date the debit order should take place by 1 June. On 1 August the debit order went off on my old account. This is a simple administrative request. There has been 30 days of no communication from MTN and no action.