It is worth checking that it is definitely the hub making the noise and not the power supply. The quickest way to get faulty kit replaced is to call them on 150 (from a VM phone) or 0345 454 1111 and report the fault, otherwise you are looking at a 7-10 day wait for a staff response on here at the moment.
Disclaimer - I don't work for Virgin Media. I'm just another VM user trying to help out so my answers may be wrong If my answer solves your problem please mark it as helpful as it may help others My setup: Vivid 200 Optical fibre with Superhub 2 in modem mode connected to a Netgear R7000 router. Telewest/VM user since 2001.