Georgia Code Title 15. Courts § 15-13-3

(a) If any sheriff, coroner, magistrate, constable, clerk of the superior court, or attorney at law fails, upon application, to pay to the proper person or his attorney any money he may have in his hands which he may have collected by virtue of his office, the party entitled thereto or his attorney may serve such officer with a written demand for the same. If not then paid, for such neglect or refusal the officer shall be compelled to pay interest at the rate of 20 percent per annum upon the sum he has in his hands from the date of the demand, unless good cause is shown to the contrary.

(b) A copy of the demand produced in court, verified by affidavit stating when and where the original was served upon the officer, shall be prima-facie evidence of the date and service thereof.