Since two Supreme Court rulings in the 1990's, the credit card companies have been modifying their contracts just by sending a notice. You could either pay them off or accept the terms.
DirecTV seems to do the same thing. Offer the customer a replacement receiver in exchange for an extended one or twoi year commitment.
It's perfectly legal. The only catch is that the customer is still committed to the original contract without a receiver to get the service.
The same happens with cell phone companies. Except, you can buy a phone.
It might be better, if you can, to buy a "customer owned: receiver to fulfill the commitment, if that is an option.
Personally, I have Dish, with owned equipment. I have NO commitment.
When my current cell phone contract is up, I'm going to Net10. It's 10 cents a minute, without all of the taxes that the Federal, State and local government's tack on.