I changed network provider for my phone so took out my old sim and replaced it with my new one. I received an email from my old provider saying ‘thank you for switching over to pay as you go’ I didn’t do this so I was confused but didn’t think anything about it. Now I’ve tried to log into online banking with details I know are correct and it’s blocked me out saying my details are wrong. Could somebody have got my old sim and accessed my online banking and changed my details?