A Demand Letter is serious.
It’s the first shot at resolving a dispute without going straight to court.
A demand letter is written notice to explain what happened; what you want (like payment, repair, return or property, etc); and it gives a deadline to respond.
A good one is clear. Has facts. Is professional.
PS. Don’t exaggerate; threaten or admit things that could hurt you in the case. Also, many contracts provide these have to be mailed by regular and certified mail; not just email – we suggest sent it all possible ways.