"Uncontactable"

I received a letter about a pre-assessment telephone appointment for the 6th May, then I received another one for the same thing on the 9th, then a text today reminding me about the 6th but worded in such a way as to indicate I had to attend the hospital. I rang the waiting list co-ordinator, no answer, then a message saying they were away till yesterday and not to leave a message but instead to ring another number. I did but it just rings forever. I have tried both numbers over and over again with the same result