A tale of 3 calls (with a happy ending)
I have a ticket AAA-BBB. I meant to book a refundable fare, but realized today that it is restricted. It's most likely my fault (though it could just as well be a mistake on my ticket). The difference in fare between changeable and non-changeable is $20. Fare basis for both is "U."
Call 1:
"Yep, you must pay the $150 fee. The add collect is $260 for your entire change."
Call 2:
"Lowest refundable fare is only ever "Y." New fare is $1200, plus the change fee of $150."
Call 3:
"Wow, that's a confusing fare rule. I can see that being an easy mistake. Therefore, let's make it an easy fix." Agent charged me the $20 to upfare to the one I originally wanted.