Email Your Vendor If Possible for His or Hers Product's Proper Instructions, If you already did and / or followed them email him back about warranty or other. And yes it could be defective , keep reading.
Always try to purchase from a vendor with a warranty & has good ratings, check the forums for good vendor list.
If that fails or does not work out, before a new replacement, try the suggestions below on this thread and on the forums, there is a lot of good info here.
FYI: You should always have plenty of atoms & batts on hand, these are all disposable / made items with a short lifespan. Try buying in bulk for lower costs.
You should also get about 10 to 14 days of minimum use out of a new atom (obviously not always the case, but too many variables here).
Fact: Its too easy to add too much juice & flood it out, it is easy to do without knowing u did it, its probably the largest cause of no vape. U can actually flood it out the 1st day of ownership if you are adding juice to your carts or dripping .
Fact: You do have to maintain your product ie, if you don't follow your manual (if u have one, hope its good, many are crap or non-existent), if you don't blow it out, clean it, leave it upside when not in use, clean the threads, don't charge it right, etc, It Will Die!
Hope that helps.