It is giving notification of every call/sms blocked.
TrueCaller has this feature. See if it's notification falls under the annoying category.
If you are using dual sim then truecaller will block it only for the number with which it is registered+the annoying blocked notifications are always there.Yes TrueCaller allows you to block spam unwanted calls
Have tried that brother but it too gives you a notification of the call/text blocked. So far I haven't been able to find an app which doesn't bug a user after blocking a call/text. I miss Symbian OS so much.This is an old thread, not too sure if it's relevant now but as I see recent activity I am posting here.
I am not sure what exactly you mean by notification but I am using Calls Blacklist - Call Blocker. Which just silently blocks call (Number) and logs the record silently in its log file. It does not pop up any message or so. A number just appears at the top right of the app icon indicating call blocked but no popup or sound at all.
Refer this thread on this forum for the link and related discussion. See if it works for you.
Note- I assume you have Android phone.