Unhappy client

My son had a birthday celebration this past weekend, the lesson was suppose to be an hour but it was cut short to 30mins, on their own accord they decided to stop the lesson without informing me the parent, their excuse was, the kids were misbehaving, one got injured and they were thirsty. My son was not pleased at all because they wanted to play but there coach decided to just shorten the lesson. All I got when confronting the situations is excuses after excuses and lies, no apology or nothing. I paid R6000 for an 1 lesson and got half, would never recommend this service to anyone for a golf party. Their service was very poor, for 23 kids and 10 adults only 1 waiter was assigned. So disappointed as I really loved that place, good sport for kids and adults but failed on parties.