You could start by posting some photos of the offending cabinet and one of the VM forum team may be able to refer these and/or you on to the relevant VM department (although the VM forum team don't generally reply on this 'Community Natter' forum). Depending on what the cabinet is, whether it is in use and how many customers are connected to it, some/all of the following may apply.
Past topics about this have mentioned a survey fee of £250-ish from which VM produce a quote for the work (which may just be a very large figure of money plucked from the air).
Search through the forum archives for similar topics and (where costs are actually mentioned) they are typically 5-figure sums of money.
In practical/financial terms, VM has no interest or willingness to move cabinets as they may service dozens of VM customers who would have their services interrupted by such a move, requiring VM to compensate them for the disruption and loss of service. Nothing to stop you paying the survey fee and getting a quote but, in all likelihood, moving a working VM cabinet is generally not practical/affordable in most cases for homeowners.
(By way of an example, here's a fairly recent link to a past topic quoting £14k to have a pavement cover relocated for a dropped kerb)
https://community.virginmedia.com/t5/QuickStart-set-up-and/CATV-cover-information-fro-dropped-kerb/m...