I've never been a betfair customer yet they won't let me join. My daughter tried to join too. Again, she's never been a betfair customer but she has not been allowed to join. You seem a really weird company on this evidence. Can you explain the reasons? User's recommendation: maybe it's just me that's had trouble joining betfair but what sort of company won't let you join them by saying i'm already a customer when i've never even registered with them?