I just left them a message. We'll see what their plan of action is I suppose.
We had 2 out of 6 Volt batteries behave that way. One needed the center post adjusted, the other needed the threads cleaned. Both are fine now. Needing a center post to be adjusted is not horribly unusual (because differences in cartos can move the center post around, as can cleaning, they are flexible) but I am not sure whether the one that needed threads cleaned had had juice spilled on it (by my roommate) or came a little dusty or something from the factory.
In general, not having tried the Mistik, the only cigarette-sized ecigs we ever found that were better than Volt were Blu disposables. The fact that it is all glued together means none of the issues you can get with reusable ecig kits. However, after 2 weeks of vaping those we discovered severe wallet damage. Now I'm on Volt X2's and 1 eGo Twist (which somehow keeps ending up set at 3.6v.....)