Placing kids in danger/washing hands of liability

My daughter went to Rush Trampoline Park in Greenstone shopping centre last night only to come home with a sprained ankle. In addition to now having an immobile daughter in a lot of discomfort I am now R450 out of pocket (R100 for the entrance fee and R350 for crutch, anti-inflammatory patches and ankle support). I went to speak to management about what they intend to do about this and their response was they intend to do absolutely nothing, saying my daughter signed a waiver of liability and so its entirely our problem. This is totally unacceptable for two reasons: 1 they are not warning people of the true dangers of trampoline parks (see for example [URL Removed] and [URL Removed] (the manager I spoke to even admitted they are having a lot of injuries) and 2) they need to carry some form of insurance - it is totally unacceptable running a hazardous business and washing your hands of all liability. Parents need to think twice before allowing their kids to go to this trampoline park.