You are entitled to alternative transportation or a refund, nothing more.
As noted in the comments, the alternative you have been offered is physically impossible unless you have a time machine, so they will definitely need to come up with a better option. If you’re not having any luck with the phone, visiting an office in person is a good way to sort things out.
In addition, the new routing goes through Wuhan with a domestic connection to Guangzhou, so you now need Chinese visas as well! Make sure you’re given a one-stop routing that does not require a visa.
Finally, if you’re still stuck with an overnight stay, it’s worth asking for a hotel voucher: they’ll likely give you one, and you should get a transit visa on arrival that will let you use it. (This is available to US citizens in both Guangzhou and Wuhan.)
Credit:stackoverflow.com‘