The GoDaddy rep is correct. If you'd like to use the unused account, you will have to backup the original account, including all emails and content, and then migrate it over to the new account.
Honestly, it's cheaper and less of a headache overall to just renew it. A lot can go wrong with a migration of any information, including loss of data.
I am a GoDaddy End User - Just Like You Check out my site! | I drink and I know things. Especially about websites and web hosting. * Please note that I offer free advice on this forum. If you would like personalized help, please contact me. Otherwise, please ask your question in the proper forum so the answer can assist EVERYONE in the community and not just you. Thanks! *
Once your issue is resolved, please be sure to come back and click accept for the solution