My Anker GANprime 747 charger has stopped working

i bought an Anker ganprime 747 charger on the late of January 2023. It’s working well until yesterday. it’s dead.
I thought I can use Anker warranty, but when I check the invoice of my order. I live in Vietnam and I bought it from a seller on shopee (an e-commercial website). He told me that his warranty policy works for only 3 months, and refused doing anything for my case.

I don’t know what to do. I thought Anker usually offers warranty time of 18~24 months. I still can’t check my warranty time on anker website. But I don’t know where should I send it to in Vietnam. This product wasn’t cheap, I really want to find a trusted place to fix it and continue using it.
Can you give me any solution?