Be happy that they are even dealing with you considering that you live in a country that doesn't sell the light. Living in a small country with limited bike parts available I've found that most companies will honour the warranty on products I bought in North America, but some will charge shipping as it's a PITA for them to go to the post office to ship the package, and using their usual parcel company (UPS, FedEX, whatever) is far too expensive for international shipments.