Here's a firm but professional draft you can send - just fill in the brackets:

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**Subject:** Request for Return of Security Deposit - [Your Former Address]

Dear [Landlord's Name],

I hope you are well. I am writing regarding the security deposit for my former rental at [Your Former Address].

I moved out on [Move-Out Date], which was 7 weeks ago, and I have not yet received my security deposit of **$1,400** back. I have tried to reach you via text message several times but have not received a response.

Could you please provide an update on the status of the deposit? If there are any deductions, please send me an itemized statement, along with the remaining balance. If not, I would appreciate the full amount returned promptly.

Please let me know how and when I can expect to receive it. You can reach me at this email or by phone at [Your Phone Number]. If needed, my forwarding address is [Your Forwarding Address].

I would appreciate a response within the next 7 days, by [Date - 7 days from now].

Thank you for your prompt attention to this.

Best regards,  
Sam [Last Name]  
[Your Phone Number]