[List the date]
Dear [Name of landlord or manager],
This letter is to confirm our [text message exchange, telephone conversation, etc.] on [date] in which I informed you that the following repairs are needed in my apartment.
[Make a list: e.g., no hot water, plumbing problem, no heat, ceiling cracking]
You promised the repairs would be completed by [enter date agreed]. Thank you for your cooperation in this matter.
Sincerely,
[Your name]