Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
I'm not familiar with the expression "s'informer à" but it sounds like the person writing the letter asked a member of bank staff not to cash a check and to return it to them. The staff member said they would do this and as an extra precaution they would inform their supervisor of the matter.