This article explains how to contact support if you have a problem with your Yahoo Mail so that the company can work with you to resolve the issue.
How to Contact Yahoo for Support Information
Yahoo has a few points of contact where you can reach the support team. To seek help via social media, go to @YahooCare. To get help via the Yahoo Facebook group, go to YahooCustomerCare. To contact Yahoo via email, enter a support request:
Open a web browser and go to the Yahoo Help screen.
Select which Yahoo Mail product is having issues. Options include Mail app for Android, Mail app for iOS, Mail for Desktop, Mobile Mail, or New Mail for Desktop.