Money back? It all depends
SO this guy wants his money back because he set up a weak password for onward transfers with his DX, Hmm! let me think NO!
Although if he bought the DX from the telecom vendor he gets service from he may have a case for inadequate security support.
And anyway what would any self respecting telecom company monitor your usage for spikes, that's how they make all that obscene profit. As a shareholder in several of these companies I can say the more dumb people like this the happier I am.