As a matter of interest, the law, here is quite specific, you were offered a TV as part of the contract you took out. Now if said TV hasn’t arrived, then it absolutely is breech of contract which means that any Court would uphold you simply walking away from VM without any penalty, indeed they would be liable for damages, breech of contract being a civil offence.
Now of course, if it could be argued that if VM made this offer, knowing full well that it might not be fulfilled, than that’s a different matter, it’s fraud, which is a criminal matter, and in extremis can, potentially end up with VM directors in the dock.
It is important to note that your contract is with VM, not Exertis or anyone else, it is unacceptable for anyone to suggest that you, as a customer, do the leg work and contact all sorts of different companies. Virgin Media, made the offer, it’s up to Media Media to make it work and supply what was promised. Now if they had an agreement with the world’s worst fulfilment centre, that’s their problem, not yours. The onus is on VM to sort it - or you go legal on them!
Of course, in reality, it’s a bit more difficult, yes, ultimately you will win, but is the hassle worth it? It might be a case of thinking, ‘right Virgin Media seem to have ripped me off, and I’ll bear that it mind when my contract ends and I can leave and go elsewhere’
