Blocked numbers

I am not aware of the process you have used for bloxking

Phone

• If you're in the Phone app under Recents, tap  next to the phone number or contact that you want to block. Scroll to the bottom of your screen, then tap Block this Caller.

When you block a phone number or contact, they can still leave a voicemail, but you won't get a notification. Messages that are sent or received won't be delivered. Also, the contact won't get a notification that the call or message was blocked. When you block an email address from Mail, it goes to the trash folder. Email blocking works across all your Apple devices.

You can also enable settings to block spam phone calls.