The steps to address this issue depend on whether you can operate the Wallet app.

*If your Wallet is operable:
Remove your Suica from the device and reconfigure it on a replacement device. The Suica will not be available until the reconfiguration is complete. 
1Remove your Suica from Wallet (https://apfaq.mobilesuica.com/faq/show/7022?site_domain=wsm)
2.  Reconfigure the Suica (https://apfaq.mobilesuica.com/faq/show/6916?site_domain=wsm)

*If your Wallet is inoperable:
Contact Apple Care for assistance.