I also lost all of my saved data when I uninstalled and reinstalled the game... I never used facebook login, so I have no backups. I emailed the support team but still didn't get a response after one day... I only remember my nickname, not full ID, hopefully they can help. I'm not gonna play the game again unless they can help restore my previous account, it took forever to level up my Slayerdramons, Spinomon, Beowolfmon, Agumon Hakases, etc.