For me, I will just pay and save the trouble. Time is money. The longer you drag, and you know that the probability of Jaben sending it back to Fitear for a free repair is close to zero, you lose both time and money in the end. I would just pay, and save the time. To me, I can easily earn back what I paid during that period of time, so it's no issue for me.
Alternatively, if you choose to pm Suyama, by the time they reach a conclusion, you will still lose out.
1. Even if you manage to convince Jaben to send it Fitear to determine if there's any manufacturing defect, it would take a long time for Jaben to send it there.
2. Fitear replies are slow, they will quote Jaben, and Jaben will in turn quote in the reparation costs, asking for your approval, and sending your message via email to Fitear(Wonder how long they will take to acknowledge it)
3, Fitear conducts repair, you pay/don't pay.
4. Fitear ships it back with a Fitear batch of new CIEMs, at the end of the day, you either: 1. Lose time and money. 2. Lose time.