Sample Authorization Letter for Opening Bank Account - Free download as (. Your written complaint may be a letter, email, or this complaint form.Mention the old address and new address and other bank and personal details in the letter. Make sure you attach the relevant documents as proof. I am writing to authorize the closure of my bank account with your branch. Just fill out the online application, and you're on your way. Yes! When redirected to the new webpage, select the appropriate form located in the form section on the right of the page. Salt Lake, Kolkata-700 064. Skip to main content; Screen Reader Access. Language.