How NOT to suggestive sell

Having been part of the fast food industry for a few years, I know a thing or two about "suggestive selling."

In QSR parlance, "suggestive selling" is when you offer the customer some added items over and above what they ordered to "complete their dining experience." That's basically a euphemism for "getting them to spend more."

While I was buying dinner tonight, the waitress tried to do some suggestive selling on me. This is what ensued:

SHE: Sir, so ang order niyo, isang chapchae and isang kimchi.
ME: Yes, that's right.
SHE: Sir, gusto niyong i-upgrade to a meal yung order niyo para may iced tea na.
ME: No, thanks.
SHE: Kasi sir, mag-a-add lang kayo ng P8.00, may large iced tea na kayo.
ME: Actually, hindi kasi ako umiinom ng iced tea. Bawal sa akin ang caffeine.
SHE: (pauses) Okay lang 'yon, sir. Flavoring at sugar lang naman ang iced tea namin. Wala namang tea iyon, so wala ding caffeine...

Needless to say, I still didn't get the iced tea.