A legal notice can serve several purposes: communicating a demand, recording a position, invoking a contractual mechanism, preserving evidence or preparing the ground for proceedings.
But a notice should not become a collection of accusations written for emotional effect.
The important questions are: What right has been breached? What evidence supports it? What remedy is sought? What is the contractual or statutory basis? What deadline is reasonable? What will happen if the demand is ignored?
A carefully drafted notice can narrow the dispute and create a useful contemporaneous record. An exaggerated notice can do the opposite.
Before sending a notice, consider the proceeding that may follow. The factual position stated today may later be examined in court.