Advise Mrs Golf of her rights. Refer to common law do not refer to statute law?

Mrs Golf is a rich lady with a golfing range. At the end of a day’s golfing many golf were filthy and she wanted to find a quick way to clean them. Mrs Golf saw an advertisement in a newspaper saying that a company produced a machine that would clean 2000 golf in 10 minutes. Mrs Golf rang Mr Iron who owned the company and asked him to come and install the machine. Mrs Golf told Mr Iron that she wanted the machine immediately as it had been raining in Sydney for 6 days and the golf were all filthy. Mr Iron said the price for the machine would be $1000 plus a modification of $300 to make it work faster and an extra fee of $50 if it was to be installed in a hurry. The machine was installed and the first load of golf was put in. Mr Iron said ‘don’t expect them to come out absolutely clean’. When the came out they were not clean and soil clung to them. Mr Iron advised Mrs Golf that he had another gadget that he could attach to the machine to help do the job better. It would cost another $200. Mrs Golf was desperate and agreed. The extra gadget was attached and failed to properly clean the golf . Mrs Golf also found out that the machine was not approved by the Water Board as it used too much water in a time of drought in Sydney. However Mr Iron had no idea the Water Board had to approve the use of the machine and neither did Mrs Golf.