Ok I received about an hour ago, a phone call from a woman who asked if i had been trying to contact her 16 yr old daughter, which I hadn't obviously, she seemed to think it might be some sort of spoofing thing.
I have checked the myvodafone account (after getting it reset as I manage to lock myself out, vodafone heldesk were absolutely excellent on that account) and there is no suspicious activity
Is this possible? as far as i can tell the daughter forwarded the number to her mother, so they possibly didn't ring back the number they received the call from