求助：关于EXPEDIA退机票的事

之前在EXPEDIA订了张下月去美国的机票，因放假时间不够，只能取消了，刚才我朋友帮我电话对方，机票是取消了，说什么钱也不能退，但是收到关于这样一封信，我纳闷，难道我还要额外出钱作为信用补偿，有这种事情吗，那我还不如不取消呢。 Per your request, your flight is canceled. You have a credit of $1,037.20 with Continental. A $236.19 penalty will be applied at the time of credit redemption. Travel must end by 10/25/2012. Use of this credit must abide by the fare rules of the original Booking.

请各位帮我看看，到底是怎么回事情，如果还要额外再承担钱，太过分了吧，我一分钱也没给拿回，还要额外支付钱。