Stop Hyper-V from the command line without powershell

I have Hyper-V and one VM running on a dedicated server at 1and1.com. I did not realize it was against their policy to "spoof mac addresses" which is apparently what Hyper-V does when you boot up a VM with bridged networking.

My server has been kicked off their switch and I can access it only through a remote server console (via serial port), which gives me access to CMD. I do not have access to powershell, the windows GUI, and I cannot download or install anything.

Which services can I stop to assure the VM stops running (It's okay if it doesn't shutdown safely) so that I can request being re-attached to their LAN?

If it helps, this is Windows Server 2012 x64.