caesars settled my live under after overtime even tho market said regular time.

Had a live NBA under bet that I made during the 3rd quarter. It was super clear on the line and slip that it was for regular time only. After the game goes to OT, the book settles it as a loser based on the OT total pushing it over. Noticed the market said regular time so now I'm confused. Support has just been spinning me around so far and I haven't seen this before.

Anyone else get their live under/over graded wrong after OT? Should I keep pushing or just chalk it up as a lesson?