Mary went to the shop to complain about her faulty tumble dryer but the manager was not helpful. He stated there was nothing he could do and pointed to a sign above the cash desk which stated, 'All products are purchased at the buyer's own risk and the store cannot be held responsible for any loss, damage or injury that customers may experience when using any goods from our product range whether caused by negligence of our employees or any other individuals'.

Which act explains false advertising and why cannot the store rely on that sign as an excuse?