Incorrect email

 Have had a nightmare lately with the hub and cam connect as part of the reset I had to sign in using the virgin o2 set up? Once again it is asking me to link my accounts however it shows a partial Hotmail account and I don’t ever recall having one let alone in the last five years of being with virgin. How can I have this removed as I can’t link the account and then can’t use any of the apps as I end up in a never ending cycle of it asking me to type the whole email out (which I don’t know) and then access that email to approve the link! It also makes sense of texts I was getting off virgin telling me they knew the broadband had an issue and to check email for instructions on booking an engineer but I never got any of the emails