A court in Singapore on Tuesday sentenced four men who worked at an electronics shop from four to 14 months in jail for conspiring to cheat customers, including a Vietnamese tourists.
Media reports in Singapore said that the four employees at the now-defunct shop Mobile Air admitted to the crime.
The case against their former boss, Jover Chew Chiew Loon, is ongoing. Prosecutors believe Chew is the mastermind of scams on customers at his shop.
Media reports said Chew's controversial tactics first came under the spotlight after employees at his shop refunded a customer $1,010 in coins.
Late last year, a video of a Vietnamese tourist begging for a refund at the shop was shared online and went viral.
Pham Van Thoai, a 28-year-old factory worker from Ho Chi Minh City, went to Mobile Air at Sim Lim Square to buy an iPhone 6 as a birthday gift for his girlfriend on November 3.
He forked over 950 Singaporean dollars (US$760) for the phone.
When he was going to leave, the shop asked him to pay an additional S$1,500 as a warranty fee to be able to leave with the phone.
Thoai, who was not fluent in English, had signed an English-language agreement that he did not scrutinize.
Thoai said he knelt down and begged for his money back, but the store's employees just laughed at him.
They finally agreed to give him S$600, but his girlfriend refused to leave without the rest of the money and called the police.
When the police arrived, Mobile Air's staff said Thoai had signed a binding agreement with them. They only offered to give him just S$70.
After members of the Consumers Association of Singapore (CASE) got involved, he received another S$400, and left the shop without the phone.