"You disclosed your one-time password"
high likelihoodThe bank says you failed the credential-protection duty and so bear the whole loss.
What answers it
The framework is a two-sided test. Even where the account holder failed a duty, the institution bears the loss if it also failed one of its own — and the notification duty is the one most often missed. Ask for the notification logs, the timestamps, and the institution's written analysis of both sides of the test rather than just yours.
MAS E-Payments User Protection Guidelines (PSN07) — Duties of the account holder and the financial institution; liability allocation for unauthorised transactions; investigation timeframes of 21 business days for straightforward cases and 45 business days for complex or cross-border cases