If at all you and your team strongly believe that the STO is worthwhile and will be beneficial on the long run, I think you should look for other investors.
Challenges like this always come up especially when you least expected them but your strong believe and faith in the project will keep you.
Nobody wants to lose. A lot of people who invested in one way or the other in ICO, IEO and other Alt coins are scared of new projects. They just back off when they hear about it. All you gat to do is to look for new investors, prove them and show them why they have to believe in your project.
Sorry about the two investors your team lost out but you don't have to rely on the past.
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