Hi Jutta84,
A warm welcome and thanks for posting on our community forums. Can we ask if you have the number that contacted you?
We can check to make sure it was a genuine number calling from Virgin Media. Can we also ask if you gave the caller any personal details like bank account details? If so we would suggest contacting your bank if you think the call was not genuine.
To stop these unwanted call in the future please check the link here https://www.virginmedia.com/help/landline/block-nuisance-calls.
Kind regards Jodi.