Charged monthly $70 for the "free 12m phone line"

Hi. I signed up for the 12 mos free phone line a few months ago. We did get a phone so I expected my bill to be $15-$20 plus my existing services. Ive been charged $69 for the phone line the last 2 months, and a 3rd bill is pending. I was told to wait 2 billing cycles for the "promo" to hasn't. On my bill but it hasnt.