Michelle visited a shop in Western District. There she took a vacuum cleaner to the service counter to pay for it. A poster on the service counter had the following statement in English (Michelle can understand English): `No refund will be allowed for any goods purchased by customer in our shop.'

Johnny, the shop owner reminded Michelle to read the statement before she paid for the vacuum cleaner at the price of $800. Michelle was busy reading messages on her mobile phone and did not pay attention to what Johnny said.

Michelle later used the vacuum cleaner at her home and found that it did not work well.

She then went back to the shop and asked for refund one week after she bought the vacuum cleaner. Johnny refused.

What is the legal position of Michelle under Contract Law.