I am also trying to leave, but I have been left on hold every time I try to call and never get through. I can only call after 8pm due to my work commitments and I've been waiting an hour on the messaging service.
If I write a letter, who can guarantee that it will be opened and read in time to give 30 days notice?
I'm sorry to hear you are still having an issue with trying to leave. We can certainly check this out to you but in order to do that I will need to confirm some information with you.
I have sent you a private message regarding this and will investigate further once I receive your reply. Just click on the little plum envelope at the top right-hand side of the page to access your inbox.