Why my account has been disabled?

I HAD TOO MANY SUBMISSIONS (WHICH I HAVE SUBSEQUENTLY DELETED) AND NOW MY ACCOUNT HAS BEEN DISABLED.

I have checked your account and I can see it's not disabled, but you're currently on overlimit status since you have already passed the available upload space for your account. 

I can see the you have a form with submissions on your trash folder, you could either restore the form and delete the submissions or purge the form in order to get available space. 

Related guides: 

How-to-Restore-Deleted-Forms

How-to-Delete-Form-Submission-Data

To purge a form, go to the trash folder, select it and click on the purge button: 

Hope this helps.