Wrong prescription

I took my son to casualty then I was given a wrong prescription when I complained they just removed the person's name and wrote my son's name,and the attitude of the nurse and the doctor when I showed them the hazardous mistake the nearly made was really bad unacceptable.I had to take my son to another doctor to get the correct medication .The medical aid only paid the doctor that gave me a wrong prescription I had to pay cash for the other doctor. After 2days I received an email from the union hospital to rate their services I told them about the my encounter a lady by the name of Debbie called me to find out about the problem I explained to her about my encounter and she said she will investigate and promised to come back to me she never did I called her 2 times to find out she told me she is very busy she hasn't had time to speak to the doctor till today I'm still waiting for her response. My problem is why does the hospital waist people's time about the survey when they know that they can't even apologize to the clients about the dangerous doctor and nurse.