Who leaves voicemails like these? There are only two possibilities in my mind, either:
a) Ritchie thought he had the type of relationship with Martin (ie friendly) that he could leave provocative messages.
Or
b) Ritchie is a raving lunatic and had a few "everything be damned" moments where he lost total control to the point that he just had to let Martin know how he really felt.
This is so dead on. That is why it should have been stopped from day one if it was not acceptable by martin.