I deal with this at one of my jobs. We offer the moon to new customers, but existing customers are constantly getting screwed over. People complain about it constantly, but corporations have no incentive to reduce the amount of money they’re receiving from you, which could open the doors to losing income from every other customer who decides to ask, when they can just roll the dice on whether you decide to go through the hassle of leaving. It’s scummy and I don’t agree with it on a personal level, but the agent you’re talking to has no power to change the system.