Just two years ago, the coupon business was the darling of online shoppers.
Buy a coupon and you get to enjoy major discounts on a range of products.
Now, some of these online coupon companies seem to be falling on hard times.
The latest is Outlet.com.sg, one of the 50 group-buying websites in Singapore.
The site had been heavily advertised and has close to 2,000 followers on Twitter and 30,000 likes on Facebook.
But merchants and customers said that calls to Outlet.com.sg have gone unanswered since last Wednesday.
It usually publicises a daily deal on its website and in an e-mail newsletter, but software engineer Christopher Ang, 32, said the newsletters have stopped coming in since Monday.
"I also went to the redemption office at Boat Quay on Thursday to collect an electric steam mop that I had purchased a coupon for, but the shop was closed," he said.
"All they had was a sign that said that the redemption office would be closed from Aug 2 to 6."
Mr Ang fears he might lose the $60 he has paid for the electric mop, especially since the collection of the item had been postponed twice by the company since June.
A check with the Accounting and Corporate Regulatory Authority (Acra) yesterday revealed that Volotek, the company that runs Outlet.com.sg, is under liquidation.
Although the sign on the redemption office stated that operations would resume yesterday, only agents from the liquidators were present when TNP was there.
Customers such as station manager Muhammad Farrid, 27, had filed reports with the police last week .
He had paid $588, half the original price, for a three-day two-night holiday at the Villa Baladewa Empat Bali resort in September.
"Two Saturdays ago, I received an e-mail from the villa operator saying that Outlet.com.sg is facing liquidation problems and is unable to pay them for the deal coupons that they have issued.
"They (the resort) are not obliged to fulfil the bookings for stays from Aug 2 onwards, which includes my stay, and referred me to contact the website for a refund," said Mr Muhammad.
He has made many calls to Outlet.com.sg almost every day since July 28, but could not get through.
Some of those affected have banded together online via the Facebook group "Victims of Outlet.com.sg", which was set up on July 31 and now has more than 140 likes.
They plan to lodge a report with the Consumer Association of Singapore (Case) and the police.
A spokesman for the appointed provisional liquidators, Raffles Corporate Consultants, said that they are taking stock of the company's assets and will contact the customers about the delivery of their items as soon as possible.
Items that have been delivered to the redemption office before Outlet.com.sg's winding-up may also be collected after inspections have been made.