Sam, from our Digital Help Capability Squad is very keen to get your thoughts, on what we need to do to improve the Help section of our website. If you have 5 minutes to spare, please complete this short survey, Help shape the re-design of BT Help Home
If you are not a BT customer, as you have found out it is unlikely that BT will do anything to help you.
Premium email costs £5 per month. Even if you decide to pay for that there would be no guarantee that you would be able to recover your emails. Normally once an email account has been deleted it is gone and can not be recovered.