Online retailer Kogan.com has been shamed as the company that customers are complaining about most often to the NSW consumer rights regulator, with a surge in unhappy shoppers after Christmas.

Data from NSW Fair Trading shows there were 70 complaints made about Kogan.com in January, up from 33 complaints about the company in January 2017 and none in January 2016.

Kogan.com founder and CEO Ruslan Kogan . Credit:Josh Robenstone

Most (41) of the complaints about Kogan in January were over the quality of its goods, with the balance relating to delivery times, refunds and warranties.

Technology giant Apple was the second most complained about company in January, with 39 complaints. The collapsed travel agent Bestjet and Samsung Electronics were equal third with 34 complaints each, followed by Harvey Norman with 29.