I recently flew to QLD to purchase a high value car. A discussion occurred, a price offered by me and accepted by the seller. I paid a cash (receipted) deposit of 2k. A second receipt was then written, stating total value and balance owing - signed by seller and buyer dated 30.9.15. The remaining monies has been transferred electronically. Can the seller (legally under Australian Consumer Law) choose to not proceed with the sale of the car, or do I have an enforceable contract in place?