The easiest way to debug this is to dig into the code I am afraid. Find the hook you're using and hook to one before the complete status and see if you get any feedback there. This will get you closer to finding out why the one you're using doesn't work. Sorry I don't have anything to show you but just my advice.
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splashingpixels.com on "[Plugin: WooCommerce - excelling eCommerce] Function after payment complete"
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