"Can't get through to dept to change appointment at St Barts"

I've got a letter telling me about an appointment. The letter has 6 different phone numbers on it for contact number/direct line/ to change appointment. Two numbers just cut off, one number puts me on hold (for half an hour before I gave up), one just rings continuously, one goes to an answer phone but I think it's for staff to access voicemails as it requires a pin! ! And the last number is for if you need transport. I've tried the email address which apparently doesn't exist anymore and told me to email another one, but I've had no reply on this. Doctor couldn't help at all either, but said she would have to have to put me through for another appointment as if I didn't turn up to this one I would get taken off the list.

It's so ridiculous, I have no idea which number I should really be calling!