Welcome to the forums @Naomi90d
Assuming you've ticked the relevant boxes on your account, the only other assumption on my part is that you too are having difficulties as per those mentioned on the following (granted older) forum thread.
https://community.plus.net/t5/Home-Phone/Call-Protect-enabled-but-1572-not-working/m-p/1817331#M3396...
If it transpires that you're in the same position then all I can suggest is that you wait for a Plusnet forum staff member to pass a glancing eye over your post and respond here - but I have no clue when this will be.
