It may be VM thinks you still have internal fittings suitable for quickstart/self install. This doesn't have to be a wall fitting often it's just a cable entering through a wall. Is there a plastic (omni)box on the wall outside your property branded with Virgin Media or Cable? If so does it have an entry point into your property?
If you have no cable entering the property you will definately need an engineer. If there is something up with the externals you may need a new cable or cable repair outside which is a different set of works altogether and will only add to delays.
You will need to call 150 (early AM is best) as that will be the quickest route to a solution. VIPs here might escalate to the mods here but it's not done in real time.
_ _ _my_background _ _ _ Former VM customer of 15+ years. 1Gig, xl TV and phone packages. Finally gave up after months, and many hours, of trying to get them to fix things. Never seen a company like them!
BT 900meg full fibre BB, TV, Netflix + HomePhone+free calls with all support in UK. (£94 all in)
if quick start has been allowed the VM have done an install in the past so search again
not all installs have an internal box
start outside and look for the external wall box - 6" square ish usually on wall facing road or pavement - brown or grey usually - follow any cables that come from it and go inside - if there are non look inside opposite external box as they may just have drilled through wall - as said it may just be a cable rather than an internal wall box
if you find a cable you need one of these to attach the cable that came with the quick start kit