Changing Email address (but is already used by me)

Hello, can someone help please?

I have come back to SMARTY after a brief and unhappy stint with another Cell/Mobile network provider.  However, to come back to SMARTY I have had to use my work email address - this is not ideal.

I have attempted to use my personal email address - however, the SMARTY system says it is already in use (yes by me).  I logged into SMARTY account via my personal email address and it says "account closed".

What can I do? I would like to use my personal email to manage my account - but it seems not possible.

Any help would be appreciated 

Cheers

AJ