Here’s a firm but polite draft you can copy and paste:

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**Subject:** Request for Return of Security Deposit ($1,400) – [Your Old Address]

Dear [Landlord's Name],

I hope you are well.

I am writing regarding the return of my security deposit of $1,400 for [Your Old Address]. I moved out on [move-out date], which was seven weeks ago.

I have sent a few text messages about this over the past few weeks but haven't received a response, so I wanted to follow up by email.

Please could you return my deposit, or provide an itemized list of any deductions, as soon as possible? If you need my forwarding address, I can be reached here:

[Your New Address]

I would appreciate a response by [date – e.g., 7 days from now] letting me know when I can expect to receive it. I hope we can get this resolved promptly.

Thank you for your attention to this.

Best regards,  
Sam  
[Your Phone Number]