Wow, never delt with anything like this in my life. I am a pay and go customer on a push button mobile. They put a £10 top up on my phone that I didn't authorise. When I rang I was sent a security code by text. On push button mobiles you cannot access or read a text message when you are on a call. The guy said I had failed security and would not continue the call, he then hung up. I rang back, different person but same issues regarding the security check. He then tried to pressure me into signing up for a contract but then became rude when I declined saying I was not getting my top up back and also hung up. This was next level.