No access to old email address

Hello. I am being sent bills to a defunct email address. Product is registered to a device no longer active. I set up a new account with a new email address, but I don't have my product code as I can't access my old email. Therefore, I have no subscriptions linked to this account. When I entered my old email address, I was sent a verification code to the same address, so I could not access it.  I have only my order number which I get on my bank statements. I would like to transfer my product to my new email and add new devices, but when I ask to edit my email address, it does so from my current account. I've searched through all the help options, but no luck and there is no live support or email that I can find in order to speak to/message someone directly. Can anyone help?