If you took the loan from the bank, but with a letter from your company, then your company has already informed the bank. There is no need for you to inform the bank directly. Your company is obligated to pay all your final settlement and ESB to the bank to repay the outstanding portion of the loan. If there is not enough funds to cover the loan, then the bank will put a travel ban on you until you settle the loan, or until you speak to them to arrange a new financing agreement.