I submitted a conference paper some time ago to a trusted highly ranked conference. Strangely enough there's almost no communication from their part, no replies most of the time to my inquiries.
The paper got peer-reviewed and accepted, I paid the fee (around 500usd), I asked just a week before the conference if it's necessary to attend it because it was difficult to book a ticket given that I had only one month left in my old passport and I didn't have the new one, I provided a proof of that (scan of my old passport), but I got no reply and considered this as "ok" since this is what I wanted.
Now I am running out of time to graduate my PhD and I need to know whether it's considered published or I can submit it somewhere else. Should I bring something stronger in my email to catch their attention like "legal fight, submit somewhere else,etc" or just wait longer (presentation was exactly 10 days ago)? what I am missing in all of this?