Asos left its Australian customer base frustrated last weekend when an IT fault meant orders were delayed or were not delivered.
Some shoppers said they had received the wrong goods or had been charged twice.
Customers took to the etailer’s Facebook page to complain that nobody was available to talk to at Asos’ customer services about the problems.
Asos said the issue had been resolved but consumers continued to post angry comments on social media.
One disgruntled consumer wrote: “Thank you for refunding my money given the circumstances. But sorry really isn’t good enough.”
Another Facebook user posted: “I would appreciate if someone could respond to the emails I have sent as you have sent me the wrong size. Such poor customer service.”
Asos currently pulls in an estimated £70m in sales from Australia, making the country its second largest market after the UK.