I think just figured out VM's master-plan method of keeping subscribers:
Phoned 150:
12:30 - navigate phone menu to "thinking of leaving" to get automated "the person you are calling is not signed in"
13:15 - navigate phone menu to "changes to package" - woman answers who asks for the landline number - I tell her I can't remember it (honestly cant!) as never use it, she sighs and hangs up.
13:20 - navigate phone menu to "thinking of leaving" again - same message.
So it would appear VM's customer retention plan is to simply cut-off anyone calling to cancel services.
Another nail in the VM coffin for me. Good riddance to bad rubbish. Looks like I'll have to write to you - I'm tempted to send the letter recorded delivery, but wonder whether there'll actually be anyone in the office to bother signing for the letter....