First try to:

vmware-cmd /vmfs/volumes//.vmx stop

If this not help try to find PID for this VM:

ps -ef |grep

In result you should receive the PID

Then you can use:
kill -9 PID

I don't have to remind you that kill -9 will stop VM immediately after such operation you might have some problem with power on the VM. In my env. in most cases I don't have any problems with killing VM processes