I'm writing to bring to your attention a concerning issue that has come to my notice. It appears that someone has been using a cheat or unauthorized aid, referred to as "zzz cheat," which may compromise the integrity of our [process/exam/competition].
I'm looking forward to hearing from you soon and working together to resolve this matter.
I'd like to request your immediate attention to this matter, as it's essential to maintain a fair and transparent environment for everyone involved. If you have any information or insights regarding this issue, please don't hesitate to share them with me.
Subject: "zzz cheat"
Dear [Recipient's Name],