I installed the new sim that I was told to apply for on 11/12 as advised when the old one stopped working but even though Virgin sent me a message to say I was set up I have been unable to connect to mobile data since.
Welcome to the community and thanks for posting. Sorry to hear you've lost mobile data connectivity following the new SIM swap.
Having no mobile data following the swap to the new SIM card would usually be as a result of having no APN settings. It's also possible we need to complete a profile refresh on our end of the system which I can do.
Are you still experiencing issues? If so, please come back to me as soon as possible and I'll assist further.