How to void a personal training contract with L.A. Fitness?

The long version: This is my second contract for personal training. With the first one, I eventually ended up with a great trainer, with whom I trained for two years. When my contract expired, I decided that I wanted to continue training with the same trainer. At this point, however, this trainer was only training me (she finished her teaching credential, so personal training was just a supplemental job). Before I signed a new contract, she and I went to the gym's director of personal training to be sure that I could continue training with THIS PARTICULAR TRAINER. The director assured me that this would be fine, even though the trainer was not interested in picking up any additional clients. With this understanding, I signed the standard contract to purchase personal training; the contract does not specify a trainer, but that was the clear understanding of all parties. What the director of training failed to inform me is that there is a company policy requiring all trainers to train 20 clients per week in order to be employed by L.A. Fitness. Apparently, this policy hadn't been enforced in quite some time, and for the first few months of the new contract, my trainer and I went on as before. But when I arrived for my training session today, I was informed that my trainer "is no longer employed with L.A. fitness, because she failed to comply with a company policy." This is not a new policy, and even though it hasn't been consistently enforced, the director of personal training absolutely knew about it and, knowing my trainer's circumstances, he was being disingenuous (at the very least) when he GUARANTEED that I could continue with the same trainer. Of course, this director has left the company for another gym (I know how to reach him, though, if necessary). The current training director has unapologetically informed me that my contract is for training, period, regardless of what I was told. I could train with another trainer or "buy out" my contract for half of the total amount due. Incidentally, this buy out option is stated on the contract, but it doesn't expressly say that the buy out gets me no additional training sessions. But that's not the primary issue. The issue is that I was given incorrect information at the time I signed the contract. Shouldn't that give me grounds for cancelling that contract? I appreciate your assistance!