https://bitcointalk.org/index.php?action=profile;u=1798183 is this the profile of that represents the company you're talking about here?
Can't find any other profile that possibly related to this DREP Foundation.

Can you provide some ss or related documents showing your communication with them? It's quite weird that Sarah or whoever that is suddenly start to attack and claims that you're not an investor if s/he didn't have the authority to know who is the investor and their SAFT details.