Jumpsquare Amsterdam-Oost

I was with my kids 2 and 6 years old. I made a ticket reservation via internet for the 6 years old kid, for the 2 years was written that was not posible to book via internet. When I went there, they told me that the kid of 2 years was able to jump only in 10:00-11:00 in the morning. It should be this information on the site. So , we paid 45 euros for me and my 6 years old kid for 90 minutes, but we stayed olnly 20 because the smallest kid of 2 years was not able to enter so it was crying all the time.