There isn't one good solution here. Best bet is to contact customer support hoping you can verify your account with metadata like DOB etc. If you still have a

There isn't one good solution here. Best bet is to contact customer support hoping you can verify your account with metadata like DOB etc. If you still have access to the account on (any) device you might be able to change your password from browser. Alternatively, you can also do the account deletion from your logged in state from (any) logged-in device.