I told the agent I wanted to change the contact offered for next 18 months. During the conversation, I mentioned that the e mail address held on my account was incorrect and he said he would change it. I was then passed to the retentions agent and agreed a change in contract and she said she would send me a copy to my email address. Suffice to say, no copy has been received and I presume the email address had not been changed. How do I fix this?