Samuel, a business traveller from India, was on a stopover in Singapore for two days. Keen on purchasing two mini iPads for his two children in India, he went to a shop in Sim Lim Square. A salesman, Benson Ong, quoted a price of $1,500 for two mini iPads. After agreeing to the price and paying $1,500, Benson Ongasked Samuel to sign on a receipt as "proof of purchase". When Samuel asked why this was necessary, Benson said this is a "legal requirement" in Singapore. When Samuel proceeded to sign the receipt, he saw very small print on the receipt that was nearly impossible to read; nonetheless he signed on the receipt.Immediately Benson said that Samuel must now pay an additional $8,500 to receive the mini iPad as well as the shop's in-house warranty. Samuel immediately rejected the transaction and asked for his money back. Benson refused saying that "he signed already". At that point in time, another salesman Hedges Ang came beside Benson and together both made threatening remarks to Samuel if he (Samuel) did not want to pay up. Samuel, fearing for his safety,paid up the total amount of $10,000 for two mini iPads.

Samuel has now come to you for legal advice on the matter described above. Discuss the nature of the transaction and its legality, drawing your discussion from the necessary statutes and common law.