I paid Origin for electricity that I don't need to pay for, instead of paying SA Water for water use on our rental property

Was wondering why I have received a notice of demand from SA Water when I was certain I had paid the bill, I had just to the damn wrong person!!! AurghhhhhH!!!!!!

Now to call them in the morning to see what to do, and it was over $300, as our stupid tennant have gone nuts with water over the quarter, and considering our bill was for the same amount, but in that period we filled a 70,000 litre pool, so they have used a crap load of water

Mumble mumle... I'm blaming baby brain, and the fact that I paid it the day I lost Flickers twin