License issues with a theme and threat to lockdown my account

I have purchased a theme from themeforest, since we are an agency we show client different sample while using theme, few clients like it and few don’t so we need to refresh the theme code.

I requested one of the theme developer to unlock my theme since its not being used on any of the websites where it was previously test.

He threaten me that he will make a complain to envoato and make my account ban. Can anyone help me and let me know that If all the websites are dead, I cannot use the theme again on the site which is live??

Author should be more cooperative in my opinion
My suggestion - Create a ticket to envato support.
They will help you out