I don't know about Geekvape policy, but many companies will ask for a video first. If it can be established that the mod is still under warranty and clearly malfunctioning, many will just send you a replacement. They know how expensive return shipping to China is. And even if they ask you to send it back, they may reimburse you your shipping cost if they determine that the mod is indeed defective. Some have warehouses in the USA.
My advice is to first take it back to the vendor and let them handle it. If they won't cooperate, contact Geekvape directly and also open a thread in their forum here and ask for help.
Geekvape
Good luck.