Agree with Mr. Davis. Your attorney's conduct appears to violate the Rules of Professional Conduct, particularly Rule 4-1.3 "Diligence" which states "A lawyer shall act with reasonable diligence and promptness in representing a client". The explanatory comment to this rule (see link #1 below) indicates the conduct you describe is within this rule.
The second link is the link to the Florida Bar website which has a FAQ and complaint form you can download, fill out and submit with explanatory attachments.
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I would report the attorney to the Florid Bar- I do not suggest this lightly. If your allegations are accurate, this attorney has violated several rules regulating the conduct of Florida attorneys.
I agree with the other attorneys that you should file a grievance with the Florida Bar. However, I don't believe that will get your initial retainer returned or necessarily deal with the outstanding balance. For that purpose, I would suggest you contact the Bar's statewide fee arbitration program, which is available to try to resolve fee disputes. Information regarding the fee arbitration program may be obtained by calling (866) 352-0707.