Always remember the HR people you correspond with are not the academics making the decision.
I've seen people go out of their way to treat HR departments exceptionally cautiously and politely like they're the hiring academic. There's no harm in being polite, but you're not liaising with the person deciding on the hire, so don't hesitate to ask them questions or chase them up on things.
I have seen it happening when hiring, that HR can easily screw up and fail to contact people. In one case an applicant was a colleague, when I told them to phone it turned out the interview was within 24 hours, they were invited, but never received a communication.
It may mean if uncontacted your application was unsuccessful, but you burn no bridges chasing an HR department for a concrete answer.