Site not working half the time, no appointments.

The site down half the time, on few occassions its working there are no appointments. Call center option 8 (to speak to a consultant) is dead. E-mail info to be advised a way forward... no reply after 2days as per their set turnaround time. I am due to travel 4 May but cannot make an appointment... "session expired" error everytime. Deleted cache, started sll the issue persists. No response e-mail.