I think there is almost no aftersale service
I had a similar problem with one of the shoulder buttons which did not have contact and the email correspondence was like real-life comedy...
The English is hard to understand, they do not know their products (tehy ask me for a photo to indicate the button) and their answers are pointless - they told me I did not map the buttons correctly...Well, if I could map that button that do not have contact...
Fortunately the GPD is good for repairs, and I was able to fix it myself. But you have to take the risk, you are completely left alone - and my device was just 2 weeks old...
However, writing them will let you enjoy some nice emails from Weenie or Anna, starting with "Hi there", "Hi dear" and they are written in purple or pink... (No, I am not joking...)