Sorry to hear about this experience @len123! As an email change is specific to your account, and sensitive information, we want to do our best to protect your security and privacy, while completing the change for you. At this time, the best way to accomplish this will be with our support team.
Our team will be more than happy to assist with this at a UK specified number available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. Please read our response to COVID-19 here to see how to contact support best. As you are in the UK it looks like only phone support is available, and email and chat are not at this time. Phone hours for your region are from 6AM-5PM CET, from Monday to Sunday. I hope this helps!