Antibiotics is good if prescribed correctly but I was still quite amazed on how the NHS working on its policy here in the UK....they seems to be giving antibiotics so easy these days

here is a sample case:

My nine year old daughter complains of frequent urinating, lower abdominal pain but no fever so i went to the surgery to have her urine to be tested and i was surprised as the nurse on the reception gave me a prescription (antibiotics) as soon as i handed the urine sample.. i thought i need to wait for a week for the urine to be cultured or have it tested using dipsticks to see if its got reaction,bacteria etc ,..I am not a nurse nor a doctor but i am not ignorant so i asked the nurse why she got a ready made presription,she simply say ''let my daughter take it and see how it goes for a few days''...
i took the prescription but didnt get the antibiotics from the pharmacy ,went home ,call the surgery again and arrange an appointment with a GP , i let my daughter drink lots of water and juices and the frequent urinating went off on its own without taking antibiotics and she's already feeling well...went to see the GP in about three days asking the result of the urine test and it says in the records 'NO ACTION' ..I ask the doctor is it 'NO rEAction' ?? ..he said no action meaning nothing has been done to the urine sample, because the tube has not been named or labeled......i did complain about it for the benefit of the other patients...how do they call it in medical term ''misdiagnosed or undiagnosed''??both sounds scary to me..