Cannot buy Lost Girl seasons 5 & 6 on Apple TV

Hi there, I’m needing some assistance with a TV show I’m trying to purchase from Apple TV. I’m based in Melbourne, Australia. The show is called Lost Girl and I’m trying to buy the 5th and 6th season. It’s only allowing me to buy per episode but I want to be able to purchase the full season of 5 and 6. I’ve purchased the other seasons of 1-4 completely fine as a full season.