Voice Line

 I have magenta 55 and we can have several lines. My daughter we added on but it says that  next to her name in our bill  it says , new line that she owes 50$. Usually or what we were told if she is added that it would come up to 105$ for all three of the lines because it is a senior plan . Also it says that her phone number has a added a voice line to her plan. What does that mean . We get a discount of 20$ now from auto pay and we are only supposed to get 15$. Hmmm It also says that she is using a different address on her line which is not true . we all have the same address. Insight anyone