I came for a blood test after my GP had authorised...

I came for a blood test after my GP had authorised this over the phone and told me that I did not need a form as the Doctors surgery would send over the relevant forms via email to the hospital. All I had to do was book an appointment online and when I turned up at the hospital they would have my details on their system and could print the form off for me when I arrived. So I booked an appointment for 3 weeks time at 5pm. When I got their apparently the receptionist leaves at 4pm every day and is the only staff member authorised to print off my blood test form . So they refused me and told and told me to rebook another appointment before 4pm. WHAT AN ABSOLUTE JOKE, HOW WAS SUPPOSED TO KNOW WHAT TIME I NEEDED TO BOOK, I JUST PICKED THE 1ST AVAILABLE SLOT ONLINE!