Virgin Media has told its customers it is "investigating" what went wrong after they were able to "reply all" to a group message.
@louisagummer Hi Louisa, we are currently investigating what has gone wrong here HB
@chrisj_brown Hi Chris. Rest assured we're working to fix this ASAP. Apologies for any inconvenience caused. MYa
@alexlspeed Hi Alex, Thanks for letting us know you've been affected by this. We're working on resolving the issue as we speak ^WM.