Greenstone Compu-kart - WORST!!

Terrible attitude from the staff, cashier told me to keep quite when me and a friend complained about the one staff member racing with our group of friends without a helmet blocking some of us during our race. My friens was complaining about his cart which was way slower than purs on the straight, the staff then took the cart and came behind my friend on the track just to bump him from behind laughing. We were told all carts are the same, just to be told by the cashier that all the carts are not the same when my friend, whom did three laps wanted a refund. Rudest staff ever, myself and another friend were shouted at to get into a cart because they are so impatient. Terrible experience, will not recommend it at all.