When you aren't getting anywhere being reasonable and logical, your next step is to ask the Court for help. If your deposit was less than $5,000.00 you can start this process in small claims. If you need help you can hire an attorney to help you, but you are better off starting in small claims. The District Court judges who hear small claims are intimiately familiar with the deposit rules and they have no patience with landlords who fail to follow the rules.
If your landlord wants to have somebody represent them, then your landlord can ask the Court to move the action to District Court. If that happens, you will do better with a lawyer than without. I have two guides on taking your landlord to small claims attached to my profile and I hope they are helpful to you.
The filing fee is $29; you have to have the Registered Agent of the landlord served if they are a corporation; you cannot serve, but a friend can do it for you. You'll have a court date within six weeks and then you can invoke the court's powers to get paid if necessary.
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If the landlord refuses to return your deposit and/or a statement of why some or all of it is being withheld within 14 days, you can sue for up to twice the amount of the deposit plus attorney fees. http://apps.leg.wa.gov/rcw/default.aspx?cite=59.18.280
Unless it is a very large deposit though, you may have difficulty finding an attorney who wants to take this on contingency, since 1/3 of twice a modest deposit might not amount to what their fees would typically be for going to court. Your best option may be small claims court, which is intended for disputes under $5000, and attorneys do not participate. Here's some info on small claims: http://www.washingtonlawhelp.org/files/C9D2EA3F-0350-D9AF-ACAE-BF37E9BC9FFA/attachments/39285D5E-B302-1D9D-41E3-E3BF638D39B7/1650919940EN.pdf
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Generally, a lanlord is required to give a detailed invoice of why he/she is not returning the deposit within the required time. (The required time vary from state to state). I agree with the other answers, you should file a claim in a small claims court. You may contact your local Legal Aid Services for legal help if you don't have money to retain an attorney.
The response to this question is not intended as legal advice and does not create an attorney/client relationship. Mr. Seifeldein has responded based on the limited information provided by the inquirer in this forum. There is a Statute of Limitations applicable in every case and Mr. seifeldein strongly advises that the inquirer seek legal counsel immediately for a complete evaluation of the matter.