If your issue is not resolved by looking through the FAQs, you can contact the Welcome Suica Mobile Support Center by email. You will need to provide your Account Number and your Secret Keyword when making an inquiry.
Contact:
・Welcome Suica Mobile User Inquiry Email Form
https://apfaq.mobilesuica.com/faq/show/7005?site_domain=wsm
・Malfunction and Issue Report Form
https://apfaq.mobilesuica.com/faq/show/7008?site_domain=wsm
・Reissue Registration (Usage Suspension Procedure)
https://apfaq.mobilesuica.com/faq/show/7009?site_domain=wsm
・Welcome Suica Mobile Inquiry Email Form for Those Who Wish to Use the Services
https://apfaq.mobilesuica.com/faq/show/7160?site_domain=wsm
*Available in English only.