Dangerous equipment

Planet fitness gym mall@55 (centurion heuweloord) treadmills are in poor condition. I tried 4 treadmills yesterday and while running at an average speed, the treadmill froze and I couldn't reduce the speed on the machine. I pointed it out to the staff and they switched the machines off but when I looked again they were switched on again and another person was having the same issue. Unacceptable equipment and someone could hurt themselves....