Do not send the product back until a solution has been agreed upon between you, dhgate and the seller. Be prepared to go back and forth for months with dhgate. You will have to be relentless and just keep bugging them. After an agreement has been reached, you can send the product back if that is part of the deal. In our case, we were dealing with 3 different sellers. 1 wanted his stuff returned; the other 2 didn't even want their own junk back.
The 'buyer protection' on dhgate is a joke. You will have to fight tooth and nail to get anything back. You will not get a full refund, but just fight for as much as you can get. Use the words 'fraudulant', 'fake', 'imitation', etc alot.
Good Luck to you. We finally got about 85-90% of our money back after 4 months of fighting.