I was thinking about this while i was painting the porch today...if it had happened to me, I'd be ...... too, no doubt. I really think your best chance at satisfaction is through your local vape shop where you bought it. I assume they've said they won't replace it, and told you to contact Eleaf. I'd contact them again, by email, and tell them they are selling a product with a warranty and then refusing to honor that warranty. Might be something the state Consumer's Affair office (whatever it's called) might be interested in. Then I'd post on Craigslist: hey if you buy stuff at joe's vaporama, don't expect aftersales support, it might be better to take your business to Joanne's instead.
Put pressure on the people most in the position to help you. Eleaf doesn't care if they lose you as a customer, you local vape shop presumably would. Sorry if this idea has been floated before.
I also realized today that when i bought the istick50, i got the 'full kit'...but the charger and cord are still in the box! I charge with a LG phone charger, now i'm wondering whether I should switch to the OEM one or keep using the one I've been using. Kind of ironic, I guess.