I'd return it also if it's under warranty. I don't know if you got the tank and/or the mod seperately, and I'm not sure that a warranty will cover destruction of vape equipment, unless you bought the two together (but I'm entirely unsure). BTW, even if it was purchased on line you may wish to take the mod to your local B&M if they are any good, mine has an electronics expert that seems to delight in fixing large messes, (for free). He really always looks happy when I march through the door, LOL. I always buy a small bottle of juice to say thank you, but if you have some decent vape stores in your area, it might be worth a shot, if they can dislodge it you can at least figure out if your battery is damaged or not, and send back your tank seperately.
Good luck!
Anna