Can I unlock my Yahoo email account ?

[Silver_Star9]

I've done something really stupid, I changed my password for my yahoo email account last week-end and forgot to write it down, and now cannot remember it. Each time I try and log in too many times, my account is locked. I've tried to contact them with my details, but didn't really set up the account correctly in the first place, so there are no security details that match. I know, I'm an idiot. Yahoo cannot help me, as they say they need the original details to send me a new password, which I don't have. Any suggestions as to how I can resolve this ? Yahoo don't seem to be too helpful.