Booked an I fare NRT->HKG->HKT->HKG->KIX, screwed up the flight time on the last leg.
Intending to book 10:30 & get an overnight in HKG to explore with a good nights rest.
Instead I booked an 01:50.....
I took a month to realize my mistake, and tried to call CX.

The website will not let me change the tickets and tells me to call.

Twice I have had varying degrees of bad service trying to call, and been unable to change.

The first agent told me - "You can't change this fare code." I followed up with "So theres nothing I can do?" and she said simply "No."

Waited a few weeks..
Second agent, got about 1/2 way through, said he found space for me on a 16:00 flight with I class, then said "Oh you booked this on CX website, we can't help you.. you need web support.. when you get the tone dial 3.." and kicked me back to the call tree I started at.

What the hell is going on?
I expect to pay a fee. But I expect to be able to change the ticket.

I've looked at varying fee table like this:
a)
Fee = JPY20,000 if Origin Japan (for the total round trip flight)
http://www.cathaypacific.com/cx/en_U...ode=JP&class=I

b)
Fee = HKG800 if Origin HK (for the leg I am trying to rebook)
http://www.cathaypacific.com/cx/en_U...ode=HK&class=I

c)
No Fee if Origin Thailand (since HK is a stopover on way from Thailand to Japan)
http://www.cathaypacific.com/cx/en_U...arketcode=THWW


All seem to indicate - yes you can change, and probably we will charge you a fee.

What am I doing wrong here?
Which fee/no fee should apply, and is it per reservation or per seat?