Fiverr doesn't offer sellers an "accept offer" button, so whenever someone clicks buy, I just have to find a way to make it happen. I'm in the US and my client is in Australia, so when they ordered something on a 24-hour turnaround late at night, I really only had 18 hours. Worse, they asked for something that I don't really offer. It's outside my niche and I was very clear about what I can and cannot do in my listing. Am I screwed?