Security Deposit Refund — Demand Letter (Texas Tenant Advisor). Demand that your landlord refund your security deposit after you've moved out.Here's everything you need to know about not returning security deposits, including a security deposit refund letter template. This article will discuss some common sample letters that you can use when communicating with your tenants. We'll also provide templates for each letter. Below are sample letters for these scenarios: Sample letter: Security deposit letter for full refund. The letter should state whether the deposit is being returned in full, partially returned, or not returned at all. We've included a sample letter to return security deposit funds for a full refund, partial refund, and no refund. If you are unable to resolve your dispute with the merchant, fill out the Dispute Transactions under the Account Services Tab and follow the prompts. Deposit Rolled Over from Tennis Key number.