Wulimbueng16 did you buy a day saver pass? This is often the cheapest option on Zurich - Zermatt when bought in advance, and it is thus possible that this was offered, and you bought it.
A Day Pass is good for all public transit in all of Switzerland. You can take any train, tram, bus etc.. at your own discretion during a whole day. So obviously our ticket will not have specific train and seat information on it, as it is not for specific train.