Question about Zhongshan hospital - Cardiology appointment

I am asking if anyone has had issues getting appointments for cardiology specialists at Zhongshan Hospital. I know they open appointments a month in advance, but I literally just looked the next day after they opened appointments and they are already fully booked.

I know I have a specific condition that is not exactly an emergency, but is there any way to get appointment by talking to someone or is there an alternative hospital for cardiology that I can check out that will have more availability? Everywhere I look says this place is the best for cardiology and many of the clinics will just refer me to here anyway. I tried to find other hospitals with mixed information and some not so great reviews.