I just checked mytesla account (as I do everyday while awaiting my lovely car.) and noticed a change in the amount due. Before this, I owed $148 for the remaining taxes or whatever that I assumed I would pay upon delivery. It now shows Tesla owes me as they have given me a $500 referral credit. The thing is, I don't know anyone buying a Tesla and so have not given my referral link out. Can anyone explain this?