To find them:
This clears all system alerts (including block/unblock logs) while preserving your starred content. 4. What to Do if WhatsApp Banned Your Account
Unblocking a contact will not deliver any messages they sent while they were blocked. New messages will only start arriving after the unblock is complete. 2. How to "Unblock Yourself" (When Someone Blocks You)
Swipe left on the contact's name and tap the red button.