When I do batch uploads, I am not asked for a term unless I select the "This is a full batch update" box, which I don't think is what you want to do. The SIS Import guide gives some pretty strong cautions, and I'm pretty sure it's a nuclear option that resets courses as well as users.
I've only ever imported a users.csv to generate new accounts, so I can't offer further help on using it to update accounts, but perhaps you can describe in a little more detail what you want to do. Do I understand correctly that you want to remove old accounts as well as add new? Is there new information in the batch for existing accounts (like changing an email address or updating passwords)?
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