There were raised voices as customers grew impatient and angry.
Their grouse was that they were not able to redeem a gift that came with the TV they had bought.
Mr Tevin Teo said he was at LG Service Centre at Alexandra Road yesterday to redeem his gift.
He had bought an LG TV on promotion and was entitled to several gifts.
Redemption began yesterday and will last until June 16, while stocks last.
Customers turned up as early as 8.20am yesterday, but were angered when told there was no stock for the LG G Tablet 8.3.
"Being one of the first customers there, we were confused why there was no stock at all," said Mr Teo, 32, an operations technician.
A customer service employee told him that the tablet was not ready for redemption due to a manufacturing issue.
The tablet is worth $499.
Mr Teo sat down to wait for his other gifts, which included a Skylanders Battlegrounds game worth $126 and CapitaLand vouchers worth $100.
"Suddenly, a commotion started and a customer raised his voice," said Mr Teo.
About four customers were involved in the argument, said Mr Teo. They were angry that they were not able to get their tablet.
Some had taken leave from work just to collect it.