Absurd Spike in Billing

Disclaimer: we are currently on a 12 month discounted plan. At the end of the twelve months (which is coming up soon) we are to start paying for our plan (which is $50 a month). However, I just checked online and it says there that our bill for next month is to be $69.99. This is a bit confusing adn irritating as we are not supposed to be paying for anything that expensive; just the basic package. Why should we pay for something we did not sign up for? Additionally, my wife recieved an email saying we would be moved to the full amount (which it says is $50 in the email).