Is this a case of identity theft?

I woke up just fine. Phone was working. At around 4, I couldn't make calls, send messages, anything that has to do with having a line. So I went into my Verizon, and it showed my device was a blackberry, when I have an iPhone… So I called, they fixed it up. Then, I couldn't get logged into my Verizon anymore. I got messages saying my cell phone number has been dropped from account, and so I called again, and I could log back in, but again, it stopped letting me. This is really scaring me guys. Please help me. What could this be.

Added (1). When I called. They also mentioned that only somebody who knows all my info could've gotten into the account. No one knows anything about my account.

You need to call Verizon again, and once you can log back in you have to change your password to something no one could guess, It could be someone trying to use your account for their phone, or a problem at Verizon. Call them now.

You should go to a local Verizon store and speak with the manager. The initial information you received about the Blackberry device vs I Phone doesn't make sense. No one would go in and change the type of phone you have as that would not affect your service anyway. They will probably have you reset your password and tell you everything is fine. The network may have been down for a short period and that is why nothing worked.