So i used miles from UA to book *A Business award for travel in early June.

SIN-ICN on SQ and ICN-SEA on OZ. All confirm and ticketed back in March. After 48 hours, i sent myself another receipt confirming all the flights are there and to save a copy for my records.

Today, i decided to check on flight times and realized that the OZ segment ICN-SEA disappeared. I called UA and they told me that there was a schedule change (flight numbers, aircraft type and departure time is the same, but arrival is brought forward 10 mins) and the space is no longer available. THIS IS ABSURD!!! The agent is telling me there is nothing she can do and she is talking to a supervisor to figure out a resolution.

What are my options here? This is truly exasperating.

Thanks