look in your area for someone that does screen repair for other devices. There is nothing super special about the S7 touch screen, and there are sure to be people that do this for iPhones and the like. If you can't find one in your area, I am sure you will find someone down in Charleston that can help you out.
I actually found someone on my local craigslist that does this work, and can order the replacement parts.
You can try calling 877-448-2934, but I don't know how much help they would be honestly (that is Huawei parts). Otherwise, try this: 7 inch 4 wire resistive touch screen panel, although I don't know the specs in detail. If they have this one though, stands to reason they have others.