Read the contract you signed carefully. There should be a term stating that you could terminate this contact in how many working days. Normally it is 10. Call them ASAP.
请教各位：对于将要开放的电力市场，不小心上当与电力供应代理签了约，３年，5.69 Cents Kilowatt Hour，已过１０天，我还能毁约吗？