Failure to cancel is a common cause of complaint on here.
FWIW, ref delivery, the last 3 times I have tried to use RM signed-for (to other companies than VM) I have had no signature on delivery, although the letters did go through. RM signed-for is a bit of a dead loss these days. A fully tracked service is needed for anything important now.
However, VM's own T&Cs section T3 state your letter is considered 'delivered' 2 working days after you posted it so, in the worst case, you have that as a reference for your 30 days notice letter irrespective of signature.
While waiting for a VM forum team reply ...
You can share your unhappy cancellation 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.
A VM person should reply here within a few days.
