Missing WWE Immortals Characters

Hi, I recently just got back to play my WWE Immortals game and found out that i have missed out quite a few characters in the game that have release. I know some of them belong to some challenge stages (which i missed it some of them). As I just check that the game store don't have these characters, so is there anyway to get these characters back??? Anyone can help to comment here. Any help will be appreciate. Thanks in advance.

Conqueror Brock Lesnar
Animal Batista
Hunter Batista
Swashbuckler Seth Rollins
Raging Minotaur The Rock
Big Red Monster Kane
Frontiersman Rusev
Red Soldier Rusev
Mad Scientist Bray Wyatt
Voodoo Bray Wyatt
Dashing Rogue John Cena
Back Alley Brawler Dean Ambrose