Teco TVS26HVUVAH 2.64kW/2.93kW Inverter Vertical Skinny Window Air Conditioner: problematic

New TECO's 2.6kW Inverter Reverse Cycle Vertical Skinny TVS26HVUVAH

When item arrived, to realize the structure became all plastic. On the contrary, old model LK1222H has solid steel structure.
The most unbearable drama is the GENERATOR-LIKE noises. It seemed that it has zero engineering with sound/vibration proof. Since it has inverter compressor, it vibrates in different frequencies loudly.

Using heating function, but compressor shuts and restarts after a long while at about 10C that makes me confused if I got another faulty item. When I read the user's manual, the suggested ambient temperature is above 7C, which is not disclosed on official website.
Wrote to TECO Australia they said it's "designed" like that.

Seriously? Is it still a heater when we can't use it at all when temperature drops below 10C?

Too much disappointment with TECO Australia. Apparently not serious with Australian market but they think about themselves at all times. When I first made the service call, they asked me to provide personal information such as date of birth. Not sure if it violated Privacy Act.
Also I wouldn't expect TECO Australia to hack to my workplace requesting me to call them back only because I left a one star review of complaint on Google. Even though they knew my personal number already from service call, they didn't call my personal number, but they hacked to my workplace to ask me to call them back.
Horrific and awful experience.
Would not recommend any business with them to anyone.