Poor quality service and bad attitude

A worst customer service ever I experienced Today at Specsavers - Rondebosch in Cape Town. I had an appointment for eye test at 11h30 and got there at 11h35, only to be told they cant assist me as the doctor will be seeing another person in 5 minutes and so they will have to re-schedule my appointment for another. I apologise and asked he lady can I then wait for that person to come out and the answer was no unfortunately they are fully booked for the day (and by fully booked they meant they closing at 12h00 and the time was now 11h40 and to do an eye test takes 10-15min??). Nonetheless I asked the lady at the help desk why did they not call me at 11h30 to advise me not to come rather than waiting for me to get there. She told me (looking at her PC screen) that I should have called to say I am running late. She showed no empathy whatsover only an ''I dont care"attitude. My whole family always go there to do eye test and I am sorry to say this but we will never ever make use of their services ever again, they pathetic.