She insisted their exchange policy was only valid for a week and that they did not give refunds.
When TNP contacted the store's head office, its managing director said that abiding by the new law was not that simple.
He said: "If they come back in a few months for a refund or exchange, we will just tell them that we cannot give it to them even if the law says so because it's just not practical.
"Fashion styles come and go too quickly. The maximum we can give is two weeks."
Of all the stores we visited, both in town and in the heartlands, one store stood out.
Staff at Stereo, a concept store that sells headphones at Ion Orchard, were trained on dealing with the law.
When our reporter asked a salesgirl if a pair of earphones that cost $29.90 would still be protected by the "lemon law", she carefully explained the process on how to get a repair and refund.
She also reminded the reporter that the period to do so was six months.
Its manager, Mr Aron Tan, 33, said they had raised several concerns with the Consumers Association of Singapore (Case) before the law was passed.
He said: "We are very concerned because replace and refund policies used to be decided on a case-by-case basis. But now, it is compulsory."
Stereo also has a fund put aside to pay customers who want a refund.
Mr Tan declined to reveal how big this fund was.
Mr Tan's other concern was the law gave more power and rights to unreasonable customers.
He said: "I previously had a customer who swam with his earphones and demanded an exchange. He said that my staff did not let him know the earphones were not waterproof."
The customer got an exchange in the end.
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