Established in 1998, it operates illegally in Honolulu, Hawaii, and offers unaccredited degrees at all levels for a "tuition" fee that is paid upon submission of a project or dissertation. While they claim to be accredited by the U.S. Department of Education, this accreditation is fake.
Atlantic International University is infamous for its substandard academic standards and questionable business practices. In your case, paying 3k for a bogus diploma highlights their fraudulent nature. Many other victims have shared similar experiences.
Avoid Atlantic International University and any other such degree mills that promise quick, low-cost degrees without real academic rigor. They may sound enticing but provide worthless qualifications and can damage your reputation and future opportunities.