you need to ring - 150 and follow the prompts to thinking of leaving - 1 - 4 - 4 as far as i remember on the keypad
BUT you might not get the result you hope for assuming you are looking to reduce your package price - VM give discounts the more items you have on the deals so whilst removing the land line would take that item off your bill other things would change - you might even finish up paying more
so if you dont use it then it might be cheaper to just unplug it
I am sorry to hear you're having issues getting through to our customer relations team. We're investigating this issue. At this time we cannot assist with cancellations or package adjustments on the community. We would ask if you can please text our support team on +44753 305 1809. Our customer relations team will be able to do a review of your account and make the best offer they can. Please bear in mind the response will not be instant, but our team will get back to you.