As you know PPTP and L2TP protocols are blocked in China. We have clients from China who can connect through L2TP with no problem. But if you see that PPTP and L2TP don’t work for you, We recommend you try the Cisco AnyConnect and OpenVPN.
If you can’t connect in any way, Then contact us to offer you some non-public solutions. We will help you bypass internet censorship.