Looks like equipment failure or cable damage. Might be affecting other customers, or even flag up automatically on VM's ops management system*, in which case repairs may already be in progress.
If the useless, third rate offshore "tech support" clowns are insisting there's nothing wrong, then you can wait for the helpful UK based forum staff to pick this up and comment, or alternatively phone up to cancel your contract. Eventually you'll get to the customer retention team, if you explain the problem and that you've got no useable connection they'll usually get it sorted. Any problems, come back here and we'll offer advice.
* I'm assuming that Virgin Media have an operations management system, although there's stuff all evidence of that in these forums.
Type 192.168.0.1 into your browser URL bar and press enter. When the page appears DO NOT LOG IN but click ‘Check Router Status’. Copy and paste the contents of each tab onto here, a Guru will be along soon to decipher the info.