Yahoo have just sent me another ridiculous set of security questions

I have just heard from Yahoo today, after two days, and they have not verified whether the first set of questions were correct, and they have asked me another ridiculous set of security questions, which they know that I cannot answer, and where they have repeated one of the questions that they asked me the first time.  Has anyone else ever experienced such difficulties with accessing their account? the new set of questions are as follows: what is the first name of your favourite uncle?, what Yahoo inbox/email subscriptions do you have? What are 5 contacts in your Yahoo Messenger buddy list?What are 5 contacts in your Yahoo Address book contact list?, and what are the names of folders you have created for your Yahoo Mail account?  Why didn't Yahoo ask me these questions in the first place.  I know that they know that I am the account holder and they are obstructing me from accessing my account.