Dell Technologies Platform Software Engineer (Taipei) interview questions

I only had one interview. I was told to prepare a 20 minutes presentation about myself in English. There were 3 senior employee, listened to my pres. and asked questions. Took one hour total. Few days later after the interview, HR called me saying I could get an offer in 1 month, because they had "procedures" to finish. Four months passed, nothing. Nothing. No email, no phone calls, nothing at all. I tried to contact the HR (after 1 month), email, phone, everything. I guess the HR lady just vaporized.