Burger radiology at advanced day clinic - scan refusal

Went to the advanced day clinic in Boksburg. My dr sent me for an emergency dobbler on my leg for a suspected dvt. I arrived at 3pm. I was the only patient there. The receptionist advised me that the sonographer is on her way out but will hear if she can help me. She came back and told me that i should come back tomorrow at 8am. Why cant you help me with an emergency if I am the only patient there and you close at 4pm? How can you be on your way out if there is still an hour left? I was simply advised to go to arwyp or linmed if i dont want to come in tomorrow. Shocking!!!