If you come across any problems with your Yahoo account, you may try to get live support from the company. You should use the Yahoo Plus Support service that connects you with the Yahoo customer service rep by phone. It is available in several countries including the United States, United Kingdom, Spain, Belgium, and Denmark. As stated on the Yahoo contacts tab, the account support is provided by a live agent round the clock.
Please note that Yahoo Plus Support is a fee-based service. You can also submit your request on the Yahoo help page. Click the Contact Us button on the company website and fill in the dialogue form. Then, follow the instructions to get help.