'Who called me' : How do I Unblock a spam number

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I use the 'Who Called Me' app to block unwanted calls (great feature!) . However one of the 'spam' numbers I need to have unblocked for my phone as its also used by my work to call me for conference calls.

I cant seem to unblock though. Ive tried setting the unblock box but then the call doesnt even ring thru. the only way i can see to get round this is to Force Stop the app if I have a conference call coming in.

Any hints?