BlackBerry Z10: My contacts got accidentaly Linked. How do I undo this?

I went to the AT&T store to get my contacts moved from one phone to the other.

They were unable to do it with their file transfer machine so the gal started selecting all of the contacts to move them to the SIM card so she could move them from one phone to the other. Half way through selecting, she accidentally clicked, "Link". Now a good portion of my contacts are all linked to one another and I can't unlink them or find the rest that appear to have vanished.

How do I find ALL of my contacts, unlink them and move them from one phone to another?

Thanks

There is an option in the Contacts app to unlink all contacts that the app has LINKED. But not sure what AT&T did...