Resolving A Disputed Cell Phone Bill

Hi,
The first thing we encounter when we call the cell phone company is that we have to navigate through an extensive electronic maze before reaching a customer service representative. After going through an excellent security screening process, we are cleared to discuss our account concerns with a representative. As soon as the itemized call detail is accessed, we realize numerous calls have been charged to our phones which were not made by us. The representative accommodates us and solves the problem by issuing us an immediate credit for the amount of the disputed charges. We then request that in the future, we are sent an itemized call detail with every bill. We are left with the impression that the billing mistakes are an isolated incident, and that we won't have to worry about our cell phone bill anymore. Thirty days later our second cell phone bill arrives. We are disappointed that no credit was given on the bill, and in fact, the amount of the credit shows up as past due. As we investigate further, we see that the any time minutes were not exceeded. However, there are mysterious $9.99 charges on three of the phones. Tomorrow, it's round two with the phone carrier.
Until then,
Alan