Bad service and waist customers time

I made an apointment for a free eye test at spec savers kollonade for my son online and i even ask online if all is in order and she replayed yes. So l cleared out my scedule for the booking and drove 1 hour to spec savers kollonade all the way from hartebee****rt dam. When i came to the branch where my booking is made they told me they cant test my son eyes as he is not yet 6years old but in less than 3weeks my son will be 6 what does 3 weeks matter and why did the online registration allow my booking so i ask for another booking and they told me i can only book online i am not happy