Apparently, I also have to explain how voices are added to this game too.

Most dolls on release, are not voiced. This is a simple fact that EN has simply never experienced prior to the M200. As EN is catching up on available dolls more and more, it will come up that a doll does not seem to have any voiced lines. Which would prompt people asking the question "Why doesn't she speak?" ...That's because she doesn't. Voices are added at set intervals and in large batches by Mica, and after some time a doll is added, she will get a proper voice. 

In general, almost 100% of t-dolls doesn't have a VA on release. The ones that do, have been in the pipe for ages but simply didnt get released for 1 reason or another (like AK-74's voice lines were in the game for years before she got released, and Type-100 who likewise sat for 2 years with her data ready.)

Until then, please remain patient and deal with it, because it sure isn't going to make Mica work any faster considering the size of the batches in general (though buying shit and being profitable may make Mica consider hiring them faster, or so I hear Kalina says...)

For a complete list of Voice Batches and participating VAs (and when they were released), Click Here. Note that the resource is in Korean.