Assuming you don’t want to return it directly to the manufacturer: did you use PayPal? Filing a PayPal case can get you a refund up to 6 months after the date of purchase.

Alternatively, your credit card company might be able to do a chargeback. I don’t know the rules in Singapore, and I’ve never done one myself, but I’ve heard that people in the UK and the US have been able to do chargebacks 12 months after the date of purchase.