Depends how you mean. I successfully raised a complaint using the online form buried in My Virgin Media. This was promptly auto-acknowledged by email, and within 24 hours they'd issued a fob-off email resolution that completely ignored the issue I was complaining about. I replied that this didn't address my concerns, explained again including the outcome I wanted, heard nothing (and nothing visible in "track your complaints" section of My Virgin Media), and after a further couple of weeks I got two letters by post - one a hard copy of the first fobbing off, the second responding to my reply, but again fobbing it off with a response that ignored the issue.
If you want to complain about the intentionally broken and ineffective complaints process, you can do that here, although any outcome will be slow and bureaucratic, and will be between Ofcom and VM, not about the specifics of your complaint.
If you still need to get the original issue of the complaint resolved, then you need to escalate the matter to CISAS, either eight weeks after you got a complaint reference from VM, or before that time limit if you reject the VM "resolution" and can get a deadlock letter issues. If you're lucky forum staff may leap in and save the day, which would be easier than formal complaints and escalations.
