Translated documents are one way to handle LEP customers. If your institution is not willing to spend the money to have translated documents, and many financial are in that situation, then consider another option, such as providing a translation service. In a translator service the documents are read to the LEP individual in the language of their choice. Such services are widely available.
A script that indicates a refusal to do business with LEP individuals might be construed as intentional national origin discrimination under the Equal Credit Opportunity Act and/or the Fair Housing Act.