Disputed late payment interest

How do we appeal against being charged interest for a late payment of Vat which was not on our account? I have called the vat helpline twice now to discuss this, first agent said the charges would be dropped as it was not our fault, however the amount is still showed as owing on our account. I called again today and got another agent who now says we must appeal about this in our online account, However there does not appear to be an option to make such an appeal. Can someone please inform myself the correct method to use. thanks

Hi disgruntled,
Unfortunately, you are unable to appeal interest via your Business Tax Account.
Please see how to appeal late interest penalties at:
Late payment interest if you do not pay VAT or penalties on time in the section “When you can object to late payment interest”
Thank you