Hi, I signed a Karate contract for my kids, and to my surprise it was for 12 months, but my kids have only attended for 3 months and don't like it. I went on today to sign a membership cancellation form and was told that I needed to pay 80% for the remaining commitment term. In the confusion there today, they handed over to me the contract and I have noticed that it was never witnessed. There is a provision next to where I signed for a witness to sign. Is this a binding contract as it was never witnessed under Australian Consumer Law or Contract Law?