The 22-year-old has the username @natwest on Twitter and has received numerous complaints for NatWest customers who assume she runs the bank's official account.
Westerman's Twitter biography says "I am a 22 year old woman and I'm not a bank" but that hasn't stopped users of the social network from angry NatWest customers hit by the computer problem that has now entered its seventh day.
Many NatWest customers have been left unable to access internet banking, with money disappearing from bank accounts or not being paid in. Miss Westerman has greeted their often abusive Twitter messages with good humour.
But her new-found fame has left her bemused. Earlier today she wrote: "Someone just came to my front door asking for an interview." Then later added: “Has had a hilarious morning."
