If you had an agreement with the hotel, you need to look to the terms of that agreement. If it was a firm agreement for a certain rate, the hotel would need to honor it, though if it had some term or condition that would allow it to raise the rates, they may raise the rates in accordance with that term.If they violated the agreement by trying to charge you more than you were firmly obligated to pay, then you would seem to have good grounds to cancel the agreement without penalty or fee, due to their breach. If they had the right to change the rates, however, then you may only cancel if and in accordance with any terms in the agreement allowing for cancellation--including the payment of any prescribed fee. So again, the answer should be found in the agreement you signed.