Retrieving emails

I used to be a virgin media customer. The monthly cost for my broadband having gone up so much, I changed providers last summer. I ( stupidly!) didn't check if I could continue using my emails on ntlworld.com forever,  I thought i could and I had no idea about the 90 days thing. I haven't been able to access my emails for 2 weeks and am absolutely desperate to get my emails. What can I do? How can I do it? Some emails are related to my medical condition and I have letters from the hospital in my mail box, which I really need access to, even for a couple if days so I can save/ transfer emails. I have phoned many times, i was  promised I could have access in 48 hours a week ago but am still unable to. I am really desperate and need help.