I had an interview at a company about a month ago. They initially said they'd contact me within a week. After 10 days of silence, I wrote them asking about the status of my application. They said that I did well, had a high test score and that I'm on the list of people they want to hire (this is an internship position and they're looking to hire about ten people).

Two days later, they sent another email which I'm assuming was addressed to all the successful applicants, saying that they would email complete terms and more information within 14 days.

It's now been 19 days, the program is due to start in two weeks and my question is - should I write them and press them for information again? Or should I just accept that the HR department doesn't keep its own deadlines and keep waiting?