I'm very sorry to hear this. But hear me out, you should have asked everything you need in your requirements page. If something was still missing, buyer is not responding and the clock is about to stop, you should have delivered what you could do with the information you have. That is not incomplete work, it is what you could do with the information the buyer provided. That's the way it is. You need to work smart and tough here. We are not dealing with cotton candy. Fiverr is about timing so you just can't be late, ever, even if it is buyer's fault.