Hi there, gwh.
My main goal is to ensure this gets sorted out.
Beforehand, are you referring to a letter from your bank? If so, you'll have to reach out to your financial institution to request this with your complete company name. They have direct access to pull up your account and provide the details to you securely.
In case you're pertaining to something else, please let me know. Doing so helps us provide accurate steps to get this information.
I'd love to know updates on how this goes. Please don't hesitate to leave a reply below. I'm always around, ready to lend a hand. Have a good one and take care.