VM's responsibility to fix all of this. I'd be surprised if they had undertaken works involving the pavement without the necessary permits, as that's business as usual for any infrastructure or civils business. Even if they didn't, and the council became aware, the outcome is only a fixed penalty notice to VM, so that'll just get paid off by VM if and when it happens.
In terms of the reported drilling through of a neighbours gate post, the neighbour certainly can demand that VM come and remove the cable and make good of any damage. As a matter of neighbourly relations you might want to ask them if they mind, and if they do, then make sure that's something VM resolve at the same time as any routing issues get addressed.
Cable in exposed conduit is permissible, if it is properly done with a safe route, suitably secured, and to your satisfaction. If any of those don't apply you are within your rights to ask VM to remediate the issue. Bear in mind that digging and burying is often a preferable option, but if this involves breaking into (for example) your drive or a made-up garden path, then the reinstatement may not be of a very high standard. I'd recommend against getting in somebody else to re-route the cable - not your responsibility to pay for this, and there's always the risk that a third party doing it manages to damage the cable (even kinking or crushing it can be very detrimental to broadband).
For this to be fixed, the forum staff can probably contact the Area Field Manager who'll need to "own" the sorting out of this. Some AFM's will just grab the matter and get it sorted, some are.....well, let's just say they get paid a salary, but there's no other evidence of their existence. If the forum staff can't get it resolved you'd need to complain to VM's CEO, and hope the CEO complaints team (who aren't the same bunch that fob off routine complaints) can get it resolved.
