Old Account Log In

Hi all, I'm really hoping you can help me with logging in to an old account. 
We have used H5P for all interactivity on our fairly large online learning platform. 
We haven't logged in to our account for a while - a few years. When I try and log in using our old log in details - it doesn't work. When I try and reset password, I don't receive any email to reset password. 

Any ideas of what to do to access an old account? 

Many thanks

Georgie