Two Huawei employees who sent a message from the Chinese telecoms Twitter account using an iPhone device have been penalized, a note says.
Tweetet, posted on New Year's Day, wished the followers were "Happy # 201
Chinese companies have been trying to control employees against Huawei products and away from American rival Apple.
Last year, Huawei Apple took over the number of phones shipped worldwide and made it to others for Samsung.
On Friday, a report from Reuters news agency – referring to an internal company memo – reported that the Huawei employees involved in the Twitter blunder had been demoted and received reduced wages.
The New Year message was quickly removed from Huawei's official Twitter feed but was shared by social media users.
The message said that the incident, which was associated with "VPN problems" with a desktop computer, had "caused damage to the Huawei brand," Reuters reported.
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Chinese companies have been trying to encourage employees to choose Huawei products over Apple in a move to show solidarity with the company's boss CFO, Meng Wanzhou, who was arrested in Canada on December 1.
Ms Meng turns extradition to the United States on charges of violating Iranian sanctions. The case has increased the tension between the US and China.