Second call: i talked to someone more competent. It does not look like Philippines. Agent's English is not mother language but i cannot guess which call centre, sound like European accent.
While searching for flights, she told me to hang up and she will call me back for some reason. She did call back immediately and we continue finding flights. The flight that was available a few hours earlier now not available anymore. I move a day earlier to get an available flight. She is able to add new flights to my booking but could not generate re-price / tax calculation.
1st part of call 1.5 hour including about 1 hour waiting in queue. 2nd part of call 1 hour 40 minutes including about 1 hour on hold waiting for support then she hang up waiting for reply from support team and supposedly she will call me when she gets reply.
Now when i check booking in account, old set of flights that would be replaced with new flights are still there. New flights are added with Confirmed status.