A lawsuit against the landlord comes with consequences if the landlord has violated their legal obligation and letting them know that you are determined to push the matter to court will make them pay back the security deposit. This letter is usually all it takes to get back your security deposit when everything else out of court has failed. The letter, with reference to the laws of Florida, warns the landlord of their interest to withhold the tenant's security deposit against the state's civil code.
To get back your security deposit, all you need to do is download, fill and send this letter to the landlord. Any correspondence and communication that is done with the landlord should be done in writing to keep record and proof if the matter goes to court. Also, make a copy of the letter and send it via certified mail to get a return receipt.