Simple. Suck up the last two months that you paid for. Refuse to renew any contracts. If you must, just stop going for the rest of the contract.
And STAY AWAY. Go to a regular yoga school. A "real" yoga school will include descriptions of the types of yoga they offer (hatha, ashtanga, bikram, etc...). You'll feel just as good, I promise. In addition, you might want to look into Qi Gong or Tai Chi as supplementary practice to yoga.
Best of luck to you!
Yes, I would agree. Get away from them. I would also urge you to stay away from the Bikram mentioned as well. Hatha and ashtanga have many good teachers, but be careful with them too. Bikram is run by a shady operator currrently in legal trouble that has been covered on this site. Not aware if there are Bikram teachers who have rejected their leader, but there might be ones that are harmless.