Oh, it is a large one! What’s the buyer’s last seen? I am afraid, I don’t know what you could do. And from my experience, I think the worth of the order you cancel would determine the level of work you’d need to achieve your 90%+ back. The last time this happened to me, it was a small order of $15, I just delivered and wrote: “Please contact me with the necessary details for this order at any time & I’d be happy to finish up the project”. And the buyer got in touch with me a week later and we finished the project happily. But hey common, this is way higher and I would not recommend that. I doubt CS can help you now because it is an automated system. If CS cancels this, it would affect you tremendously, The best you can do is to hope the buyer responds to you soon.