Rise of the Tomb Raider Seasons Pass ?

So i was looking at the Xbox Live store and noticed a little banner about extra content for this brilliant Rise of the Tomb Raider game.the content was something called Endurance Mode priced at £7.99.

So as i think this game is brilliant and looking at this mode i decided to buy it,that is until i firstly looked up the cost of the seasons pass as this is obviously included.

What the hell i thought I'm buying the seasons pass this is a game that deserves it,on clicking on the seasons pass i didn't get the option to purchase it just the option to manage the game content.

When i clicked on that it downloaded the new Endurance mode and 3 other bits of content,i really don't recall buying this seasons pass but i guess its not a Microsoft flaw and my memory is to good

Anyway its all downloaded so look forward to even more game types and challenges in this wonderful game.