Scholarship case - Accepting more than one university offer
You didn't realize that saying to one university "yes, I accept to study full time at your university" meant that you couldn't accept the same thing at another university? Even as a student of another country, you should have understood this.
For the matter of needing to accept 2 different universities for 2 different scholarships: you can't. Either you need both scholarships to agree to both pay for the same university, or you need to make do with 1 scholarship.