betonline says max win exceeded because parlay odds changed after acceptance

I hit a 4-leg parlay on a niche sport overnight, but when I logged in this morning, the payout wasn’t there. Customer support says they’re voiding it because the odds “changed after acceptance” and it went over their max win for that event. Thing is, the bet was already confirmed and all the legs graded as winners. They’re just quoting the T&C about max payouts now, but I don’t see how that applies after the fact - shouldn’t those limits be enforced before I even place the bet, not after?

I’ve seen books void stuff for obvious errors or line movements, but this doesn’t seem like an error. The odds were all normal at the time. It feels kind of scummy to adjust limits only after a longshot parlay hits, like they just cherry-pick which wins to pay out. Not the first time I’ve run into something like this on these sites, especially when using crypto. Curious to hear if anyone’s had a similar mess and how you navigated it.