The same thing happened to me a couple of months ago, @yekrats. I'm also on Republic Wireless. I sent a message to Tech Support, was emailed about a week later, and was asked to email them my id. After that, my Manna account opened very quickly.
They also said they're aware of situations like this with different carriers in different parts of the world, and are looking into it.
RE: First Steemit, Now Manna: 100,000 Hit