Adobe Sign - Account management

Good Day,

     My company has multiple users on our Adobe sign accounts. With moves going on in our offices we have made adjustments on who needs to have what license and access. We have successfully deactivated a user for adobe sign, but now we would like to re-use that license or membership for someone else. When we attempt to do that, it gives the new email a unique email address and does not issue a notification to the new user.  Can we re-use the adobe sign subscription/membership that we deactivated? If so, how can we sign that new person up?  Do you all have instructions on this? I have tried to call the 1800-number and I was on hold for over an hour.

Just looking for assistance.