Small black spec/dot/patch thing in lower center/left of screen

Hi,

I just got my PiMax 4k from JD and noticed a small black mark in the image, I’ve viewed several videos and launched a space station demo and it appears everywhere - it’s in the right eye (not visible when viewing thru left only) and it almost looks like a tiny piece of plastic or something. I can take a photo with my phone up near the lens but it’s not very clear (can see the mark/black thing but it loses shape).

I live in Chengdu, is there a service center I can take this to or should I contact JD and look for an exchange? I know it’s specific to my device as my friend has one also and it doesn’t have this problem.