I contacted your customer services and it was a waste of time. Your agent told me that I need to get a lawyer to get power of attorney, I told him to call my mother on her virgin mobile number and she would tell them that I can act for her. He refused and again said that the only way to deal with this is to get power of attorney.
As you won't tell me why you are taking £63/month from her account I have no alternative but to tell her to stop the Direct Debit. Any legal letters will have to be sent by post as I repeat that she can't access my fathers email account.
I also have an issue with Virgin Media taking £37/month for her broadband which she doesn't use (and also has no need for a landline), again your customer services were unable to help as I don't have the password (they are posting out a reminder to my mother).