They replied to you on 3/21 indicating that you need to open up Web support case (go to http://www.adobe.com/support/digitaleditions and click on "Submit a web case")
Web cases typically take 3-5 days to clear
Adobe does not provide support for Digital Editions using Phone support.
Adobe does not provide support for Digital Editions using Web Chat support.
If you use either of these venues, then at best you will get the correct advice (that you need to open up a Web support case), at worst you will get bad advice and nothing will happen.
But Mani told me he had spoken to someone and that they would reset my count for me and then email me, so I assumed that would happen.
As I am 59 years old and not technically minded I am sure the reason for my too many activations is my own fault as I listened to to many peoples advise about installing and uninstalling and so forth just to get a book transfered. But all I want to do is read a book and when Mani said they would reset my count (whatever that means) I thought this would happen.