Affiliate Marketing Secrets

I am having problems signing into my email. I was told to change the password by Yahoo due to a concern about someone breaking into my account. So I changed my password and I am no longer able to access my account. So I call Yahoo customer service and everyone I speak to tells me the same thing. There is a security question that is affiliated with my account that I did not choose, therefore there is no anwer to the question. I believe that at one time this was a default question that was added to my email account. Anyway, I keep trying to explain this to the customer service reps and they keep calling me a liar, telling me that this must be the password I chose, when in fact I never chose that question. How do I get them to believe, I have not be able to access my email for a month. Can anyone help.