How to get warranty in mainland china

[yim.w]

i'v bought thoughram z-one memory  8G*2  from amazon.com ship to china augest 2020,during use, I found that when the memory usage was high,using the core display,  the screen would be blurred, after replacing the memory, the problem was solved. since i bought it from amazon, i contact the mainland china warranty service,they said since i bought from amazon, it cannot be covered by mainland warranty,I 'd like to know how to get the warranty  now.

The SN is R010D408GX2-3200C16AXGF00235

And I'v been issued this problems twice via https://my.thermaltake.com/tw/csErma.aspx,but got no respond at all, I don't know why, plz contace me at once.