demand letter
nounUK /dɪˈmɑːnd ˌletə/
US /dɪˈmænd ˌletər/
A letter that firmly asks someone to do something, like pay money or fix a problem.
The company sent a demand letter asking the customer to pay the bill.
OTHER MEANINGS
2. A legal letter that warns someone to act before a lawsuit starts.
She received a demand letter from the lawyer about the unpaid rent.
3. A message that strongly tells someone to stop doing something.
The neighbor sent a demand letter to stop the loud music.
4. A written request for money that is owed.
The bank mailed a demand letter about the overdue loan.