Urgent Credit File Amendment

Hello Team - Urgent Credit File Amendment 
Account Number [MOD EDIT: Removed]. Area Reference Code 14
I received written confirmation from your company stating that the balance on my account was zero, with no outstanding amount owed. However, my credit report is currently showing payment history issues for August and September 2025, which is unacceptable given that I had no outstanding balance at the time the arrears were recorded.
Please treat this as urgent. I currently have a mortgage on hold due to this issue and I am at risk of losing a significant amount as a result. This situation is particularly concerning, especially since your company has repeatedly confirmed that I had no outstanding balance.
I would appreciate your immediate assistance in resolving this. Thank you.