Where are you seeing that you are being "billed" for the minutes? Are you looking online? Are the calls in the bill detail showing a s Plan Allow minutes rather than NW or M2M?
If it's near the beginning of your billing cycle and you are looking online, things may not get sorted out right away but they will be right when you get your bill. Did you recently change things with your account(s)?
Depending on your calling plan you should be able to call any of the 80+ million Verizon Wireless Customers without having to add them to your F&F and in fact, would not suggest you adding them as they are already covered...