You’re taking their wording too literally. You wrote asking them if 24hr was enough notice, and this response was Sinergia asking if they could instead tell you how long they’d need after reviewing the draft. You don’t have to accept that — you could say you’re not willing to hold off on publishing for more than a week or something — but when you didn’t respond to it Sinergia was right to expect that you wouldn’t drop a draft on them with 24hr notice before publication.
You’re taking their wording too literally. You wrote asking them if 24hr was enough notice, and this response was Sinergia asking if they could instead tell you how long they’d need after reviewing the draft. You don’t have to accept that — you could say you’re not willing to hold off on publishing for more than a week or something — but when you didn’t respond to it Sinergia was right to expect that you wouldn’t drop a draft on them with 24hr notice before publication.