My last bet was staked multiple days before the adjustment (jan 27th). The error likely occurred as bets were being settled around the 31st-1st feb, so I never used any money from the error to place new bets.

When I check all my betting history, everything is settled properly so I don't understand the problem.

I am in contact with their support team via email now who asked me to compile all my sportsbet P/L and send it to them so their accounting team can verify.