Mantis, I believe your wording is a better choice: 25 dollar additional purchase required, excluding cigarettes etc etc.
The definition of 'total' is the sum of all. It's math and shouldn't be debatable IMHO.
I think I'd leave the specifics of the interaction out of the report, otherwise it could call attention to you.
Evaluating and mailing packages since 1994. I am an undercover connoisseur of customer service, a master of disguise in the aisles, and a sworn enemy of subpar experiences. I blend in, observe, and report—because excellence should never be a mystery.