I take it you weren't offered the "2 Year price guarantee"?
A couple years ago I had internet only and when my contract expired I still received the same price for about 6 months after. I didn't see a price increase until the speed was increased which came with a higher cost.
If you're concerned about it, you can always ask to renew your contract.
All you have to do is call customer service and ask them to renewal your contract and see if you can lock in a price for 2 years. If you need the number it is 1888-553-1555. But just let you know sometimes prices can change so your price could stay the same or change, but you can ask them and see what they can give you.
Michael