As much as I have every sympathy with anyone experiencing the (at times) significant call queues with VM C/S at the moment, they are answering - you just need to be patient, understanding of the current situation, and potentially call earlier in the day.
When you call to issue your cancellation notice to Virgin, be aware the agent may well try to resolve your reasons for leaving and put them right. Be sure when you call, whether you want that to happen or if you are determined to leave and already have install dates with your chosen new supplier lined up.
I would also recommend that you try to overlap your new install, with VM's disconnection - otherwise you may find yourself without any services for a period of time.
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks