I was told I'd get an offer by 10th. Then I made a call to my hiring manager on 12th, which he didn't pickup. I left a voicemail, and he has my number because we've worked together before, but it's now the 19th and I haven't heard back.
I am going to accept another offer now anyway, but how should I interpret this behavior? Do things like these happen in the industry? What could be the reason?