My NUC is malfunctioned and I've sent back to your customer support department. But the agent told me that: 'Regarding the replacement, I have no information on this matter. For now, all you can do is wait.'
This is a frustrating answer and I am not considering buying another NUC just for the gap period.
Could you please help me to find a better solution for it?
What were you expecting - that your implied threat would somehow magically speed things up? The process is the process and, once it has been initiated, the support agents on the phone and here in the forums have nothing to do with it - and you were told that. The unit has to be shipped to Intel, processed by the returns people and then a replacement unit shipped back. There's no shortcuts to be had.
I wish there was a better answer, but there simply isn't. I am sorry you received a bad unit. Intel tries to minimize this happening but there are still exceptions.