Formal complaint to VM first of all (most likely an unproductive exercise)
https://www.virginmedia.com/help/complaints
is a required first step before escalating to arbitration
https://www.commsombudsman.org/
If you are no longer a VM customer post your VM complaint to VM with the relevant info etc. to identify you/your account. Use a first class signed-for delivery service for proof of delivery.
8 weeks after you first complained, or earlier with a deadlock letter if VM fails to resolve, you can go to arbitration.
One of the VM forum team may offer to help when they reply here within a few days.
You can share your unhappy cancellation (and non-refund) experience with OFCOM.
They launched an investigation into VM on 13 July 2023 specifically into VM's cancellation and complaints processes.
https://www.ofcom.org.uk/about-ofcom/bulletins/enforcement-bulletin/open-cases/cw_01275
Case ref. no. and an email at the bottom of the above page or submit with same info via the contact form
https://ofcomforms.secure.force.com/formentry/SitesFormCCTMonitoring
Submitting information won't help your individual complaint but it will contribute to the OFCOM investigation and it sounds like your experience is directly relevant to the terms of reference of the investigation.
