The plaintiff, his agent, or attorney may controvert the answer of the garnishee by making oath within 30 days after notice of the filing of the answer that he believes it to be untrue. Thereupon, an issue must be made up, under the direction of the court, in which the plaintiff must allege in what respect the answer is untrue; and, if required by either party, a jury must be impaneled to try such issue.
Ala. Code § 6-6-458 (1975)