Battle.Net Conversion Problem (Again)

Hi, I've been playing WoW on warmane since molten.
I stopped playing like almost a year now. Recently I wanted to get active again and play WoW.
So I downloaded the game. "Mist of Pandaria".
When I connect it said that I need to covert into Battle.Net account to play.
The problem is, I already did the WTF folder, realmlist, deleting cache, changing IP address, all those stuff.
I even contacted warmane throught Facebook, and was suggested I redownload the game.
I also did that.
Let's just say, I did all the things that Google can give me.

The thing is, sometimes I connect the game and was successful but most of the time it said the Battle.net conversion thingy.
It's getting really annoying.
What I did to get different result was unplugging and replugging my LAN cable. and sometimes uses wireless connection.
Sometimes I can connected successfully, mostly not.

I really wanted to play the game.
Please.... If anyone have any solution, please do tell.

I guess you are already doing it correctly but just in case... use AccountName to Log-in, not Email address
your problem is really weird, in case you have downloaded the MoP "new" ( so with Wod models) I can suggest to download the "MoP old", I do not know if it might work but since you have nothing else to try...