Someone has set up accounts with multiple betting websites (like William Hill etc), using my email address, old postcode, date of birth and, in one case, my mother’s maiden name as the security question. I feel really worried about how this person has all this information and why they would set up betting accounts with that information. I’ve contacted each of the betting companies and they are looking into it but does anyone know why someone would do this and what else I should be doing/thinking about? How has someone linked all that information?