Unresponsive service

On the 19th of June I sent an email to *** to request they change my banking details for my debit order.

It's been 2 weeks and I have received no acknowledgement on my email or confirmation of the change.

But they can promptly deduct their debit order from the incorrect account.

I am done following up with companies to get good service. I'm an elderly woman who can't hear on the phone and have to ask my son to do my admin.