He also tried to get the girl's 16-year-old friend to work as a prostitute but she lost her nerve and the 15-year-old took her place, the court was told.
The complainant had suffered from depression and substance abuse since leaving the brothel.
Hastie appealed both his sentence and conviction in the Court of Appeal, arguing the trial judge should have directed jurors to deliberate further before telling them they could reach a majority verdict.
The Court of Appeal rejected the argument but Hastie then went to the Supreme Court, which has granted him leave to appeal his conviction.
"The approved grounds of appeal are whether the directions given to the jury before it delivered its verdicts were appropriate and, if not, whether this gave rise to a substantial miscarriage of justice," the Supreme Court said in its ruling.
The court will now consider the appeal.