You do that by solicitor's letter, not a phone call.
Paul was making a appeal to the media in general. And you only do that by giving an interview to someone you trust to be sympathetic.
Was the Sun printing lies about his wife?
Previous Sun story
Lady Macca faces op
The Sun, UK - 22 Jan 2004
By THOMAS WHITAKER.
SIR Paul McCartney’s brave wife Heather is facing major surgery — as a result of having the baby she always longed for. ...
Neither a lie nor unfavourable