At first, I was got an interview, and told me a time that will be called, but I didn't get any call that time and waited for 30 min. I emailed but got an reply that they had a client and cannot interview with me and scheduled next week for the same time. However, I still didn't get any phone call or an Email.

This company seemed really sketchy. I was asked to sign a NDA to even be considered for an unpaid internship. When I followed up to ask why I was ignored and seemingly dropped from consideration. In all likeliness this seems like a scam to take advantage of someone desperate for work experience.