Hmm if you're able to log into the account, but can't find your character, go through the new character creation screen and try changing server; it might've defaulted you to a different server than where your original character is. If it still exists, you should be able to see it on the server list.
If not and it really is gone-gone, try emailing support at Support@OneThumbMobile.com
with the details (character name, level, class, any notable purchases) and they might be able to locate/restore it.
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Support isn't on forums; email bugs to support@onethumbmobile.