Aspire ET-S clearomizer Tank Broken

The treading broke off the tub assembly when I was unscrewing it for the first time, How do I go about in returning it. None of my local stores carries the Aspire ET-S clearomizer, and i already bought the BDC coils for it. I will hate to have all the money go down the drain because of the tub assembly not being able to screw on anymore because it is broken.
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