I had my phone in a waterproof pack on me, because...

I had my phone in a waterproof pack on me, because i didnt want it stolen or lost, i wanted to make sure i had it. I waited 30 minutes in a line for staff to tell me I cant have my phone on me in the slide. Now my phone is turned off and i proved it and they told me i had to walk back down and put it away to get on any slides. I have never been to a water park that you are not aloud to have your phone or any device on you. Very disappointed, and disappointed in the attitude the staff gave me. No where near polite about the situation.