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I am not sure what you are referring to about an "investigation"... The experts here aren't private investigators or police who investigate situations for customers. In the legal area, the experts are all licensed attorneys in their various disciplines who answer questions and provide legal information to customers.
But there is no investigation needed here...you are being scammed and if you have sent them money, they will now want more and more because they think they have their hooks in you. So as I said in the other question, cutting off any contact and blocking any numbers is your best recourse here.