Cell Phone Package Homework?

Have to develop an application that will let me choose between cell phone plans, individual and family plans i have the forms and all choices done,. new forms open and old ones hide to keep it clean. i think i got all the variables declared, and got no debugging errors, but when i select the options, it always gives me the following:

1. adds one more phone than selected

2. only shows phone subtotal, tax and total

3. prices for options and monthly fees never show

Here is my code for all 3 forms

Public Class frmMain
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
End
End Sub

[code]....