I think DJ Miner only has this website:
www.whatsminer.netI would be suspicious about any other DJ Miner websites or email addresses.
DjMiner are more like the distributors of whatsminer just like pangolinminer.
So their site is djminer.com
You can reach their support through:
support@djminer.com or
sales@djminer.comI think they are legit
What I would be suspicious of are the sellers from B2b sites like Alibaba. But from what I know. Alibaba acts as an escrow (they have buyer protection) where the buyer first receives their items, confirms that they work well before informing Alibaba that the Item was shipped. If things go wrong, the buyer can open up a dispute within a given period.