If you want to leave VM or discuss reduction of your package to something you might be able to afford then call 150 (free) on a VM fixed line or mobile phone or 0345 454 1111 on any other phone (chargeable). You'll need options 4,5 on the phone menu. You'll have to give 30 days notice and you'll be charged for that period.
Please remember that if you could be faced with early leaving charges (a maximum of £240) if you are still in the minimum service period of your contract (probably 12-18 months, depends on the deal you had).
Hope you get back on your financial feet soon. Good luck
Superuser 2017/18 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.