Yes, the Tribunal complaint would be the last resort if Asus does not respond in due time and manage this issue properly. I am giving them enough time to respond before doing that. One of the clause is :-

v)    receiving payment for goods or services without the intention to supply; 

In some cases, some people will only be afraid if they get the letter from Tribunal to appear in court, then they will find ways to avoid this by settling with the customers before the court hearing. Sometimes this is the only way to be heard otherwise we consumers taken for granted.