Price increase while on a contract is wrong

So why have a contract with comcast if they are increasing the package price on me? To me this is not legal. I called and they said too bad we can do it whenever we want. We are updating all our products and so are other vendors, so we have to change our prices. But in the contract, it only says the Service fee and Equipment and things like pay per view etc can increaseduring a contract which you can guarantee will happen each year so last year I did not get upset. But now they are increasing my package price as well. 

I ask again why even offer a contract to the customer if you know you will charge after it is signed?  The representative had no answer for that.

Xfinity package:
Popular Double Play increase of $7.00
Equipment & services:
TV Box + Remote increase of $2.00
Service fees:
Broadcast TV Fee increase of $4.40
Regional Sports Fee increase of $0.10