Hi soltantde2
There is no guarantee that you will receive a call from outbound retentions. You need to check your marketing preferences to make sure you are allowing VM to contact you, it it's turned off then you definitley won't receive a callback.
Sign into My Virgin Media then Account Settings > Marketing preferences, and make sure there's a tick next to "Sounds good! Keep me up to date" . Change it if necessary and scroll down and click on Save Changes. It can take up to 28 days to take effect.
Some things to be aware of if your wife signs up as a new customer.
If you currrently have a VM landline then you will lose your VM phone number when cancelling.
Also any VM, ntl, blueyonder email addresses will be deleted 90 days after leaving. They can't be transferred over to a new account.
New equipment will be supplied so that will be a main 360 box and if a second TV box is needed it will be a 360 mini box which doesn't have a hard drive. (Tivo and V6 boxes are no longer supplied to new customers)
Also in the unlikely event that there are capacity problems in your area then VM may not be taking on any new connections, or they may be unable to supply speeds above M350.