[kakakakakaroto]

Prior the end of the investigation, past 7 days (no refusal yet), I contacted them via mail :
0/ tell any behavior that indirectly shows that you really did not get the item, to add some credibility and to force a non-generic reply
1/ ask for an update on the investigation
2/ say any excuse to tell that you used money to have another device bc you trust their words
3/ be as polite as possible

You will likely deal with agents who fall for the same SE once. So please, add some original statement into it if you don't want it to fail.