What should you do when someone continues to mispronounce your child’s name?

What should you do when someone continues to mispronounce your child’s name?

My children all have foreign names, their father is from Nigeria and so are their names. My youngest daughter’s name is Amina (a me na). She has an instructor whom not only constantly mispronounces (a mean a) it but also misspells it. She is at the tender age of three so she questions this and is now beginning to say her name incorrectly herself. I correct people including this instructor whenever I am present but she insist she just has a hard time with names.