If your Google Adsense Account is blocked (temporary blocked) means for the invalid activity google adsense team block your adsense account as a WARNING for INVALID ACTIVITY for 28 days. In these case adsense team will send you an email about the Invalid activity.
We have to fill a form to appeal for Re-Activate the Google Adsense Account.
Google Adsense Appeal form Invalid Activity Appeal Form
https://support.google.com/adsense/contact/appeal_form_non_login
