Chat is unavailable - question regarding e-mail Acrobat Sign

I would like to get in contact with Adobe (in written) but the Chat is unavailable. Tried to call but there was no option for my issue, tried to choose another one but didn't come to an human being. (I rather would like to have a written conversation to get track of the conversation)
Our users have got an e-mail about Adobe Acrobat Sign which is saying that they have got a new Acrobat Sign-account and their existing Acrobat Sign-account needs to be archived. To my knowledge our users do not have an existing Acrobat Sign-account.
Need to get more info about what this is about and how to handle the questions from the users.