First of all, AirAsia releases a promotion whereby tickets are 50% cheaper if you pick a seat during the booking.
Second, if you try to book the flight by booking the seat, the system does not give you the discount.
Third, if you try to speak to the customer service, it basically does not answer your question and literally leave you talking alone.
Fourth, the terms and conditions are not clear. For instance it will clearly say that the travel period is "Travel Period: 5 September 2017 – 8 February 2018" but then it will have in the notes "Discount will not be available during peak periods." and finally it will not disclose what "peak periods" actually mean in terms of dates!
What a joke!
I'm attaching my attempt of discussing my situation with the customer service.