"Poor communication and attitude by staff"

I arrived at mid-afternoon for a prolactin blood draw. However, there was no receptionist at Osborne Park path west collection centre. I sat down and waited for someone to attend to me, knowing that I had to sit for 30mins before the blood test. 

Almost 10 minutes later, a staff member came out and got the form from me and proceeded to, I felt, raise their voice at me saying that with prolactin test, I had to sit for 30 mins before the blood test and they do not want to work overtime. I tried to explain myself but I felt I could only get one word out and they then cut me off and I felt, yelled at me again saying I had to come 10 minutes before my appointment time the next time and my time seated in there waiting for them to attend to me was not counted.

I do realise that time is tight but I wasn't expected to get yelled at so badly. At least give me the chance to explain myself or tell me to come back another day nicely.

I hope this will change and no one else gets yelled at. I believe there is CCTV footage at the collection centre. Please review your employee's behaviour. Thank you.