Write a letter to the supermarket manager explaining what has happened. Tell the manager how you feel about the error and ask him to some this about it.
letter to the supermarket - Writeacher, Monday, November 22, 2010 at 8:40am
See the previous post.
Keep in mind that no one here will do your work for you, but we're happy to read over what YOU WRITE and let you know about any corrections or revisions needed.