The server is unreachable from China because of the influence of Chinese firewall. The whole thing is very unpredictable, any IP can be blocked by it.
We are not able to change the IPs.
In order to find a working IP, we suggest buying additional ones. It usually takes up to 5 purchases to find a suitable one.
Note, you have to buy them one by one, not several at once!
When you find the suitable IP, you can use it.
Send us the list of the unsuitable IPs and we'll refund for them to your account.
If you keep using the VPS you will use the payment for the next month and money won't be lost.