I'm not sure it was false advertising, the product was called "UnContract" "Mobile One" not "eternity price lock forever plan", the customer can choose to not pay any more if they cancel their contract before they pay again after the current contract period ends (all contracts everywhere for everything in history are like this), if the details were in the faq that they could read before signing the deal, then that's the deal they signed. It's deceptive, maybe fraudulent, but I'm not sure it's false advertising.