You should be able to report faults by calling 150 or 0345 4541111 and following the options for "I have a fault with my TV service". Despite call queues, it is probably still the quickest - and almost certainly the most efficient - way to report such things.
If you're really struggling, you can try the text messaging service, I'd personally be uncomfortable reporting service affecting stuff that way, but it's something else you can try I suppose.
Or the forum team might pick this thread up, that may take a couple of days.
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Sorry to hear about your signal issue and I've taken a look at your details and can see that a tech is required. Your TV box is currently unreachable so I can't perform a thorough check but your Broadband signals are showing a lot of errors for your upstream power. I've arranged a tech for you and you can see the details via your online account where you may re-arrange it to a more suitable date.
Although I've booked it under broadband, the tech will be able to check your TV box also and do let us know how it goes.