Change of debit order date; unable to send an email

I really didn’t wanna do this,

Tried to explain to the contact center agents twice but the calls were dropped.

Months ago I called in to make arrangements for a debit order that would go off my account on the 21st of every month, that was successfully arranged telephonically,

Two months ago I changed jobs and called in to change the debit order date, initially it was a struggle as the contact center agent insisted that I have to send an email and it didn’t make sense to me as to why the initial arrangement didn’t need emails and now it’s a different story, the agent spoke to their team leader, came back on the call and provided me with a number to contact and change my debit order date, I spoke to a lady who the confirmed that the date has been changed from the 21st to the 25th, which clearly wasn’t true.

Now here is the problem-

If I didn’t have funds on my account today, the debit order was gonna be bounce, which will affect my account profile.

I organized the debit order for the 25th cause I know there will be funds available,

When I speak to the contact center agent today to assist providing the contact to change the debit order date, they are unable to do that.

If it was done previously can it be done today,

Can someone please contact me to change the dates for July, i need this to be done telephonically as it was done previously.

Thanks