LOL same problem as me.
You can go to any of the country logitech to log an email but it won't work.
Local Logitech will NOT entertain any logitech products outside of singapore simply because logitech do not have international warranty. They will NOT repair your spoil logitech products cause logitech singapore only do replacement, not repair.
Chat with Logitech singapore, they ask me email to logitech USA so they can guide me to do the warranty claim. Email logitech USA and it has been week and they still never reply me. End up still can send me an email to ask if they have solve my issue and if not reply them via that email. I reply back and few days passes still NO email.
SAI logitech support.
Anyway i contacted Amazon telling them logitech singapore do not want to rma for me and amazon refunded me 50% of the cost of the mouse.