Yes, I experienced an unauthorised transaction more than 3K before. Luckily CC service centre informed me the suspicious act from my CC, so i asked the service officer to block my card. Later, the customer service officer asked me to raise a dispute form. I follow what exactly they told me and every day i called to the CC centre to update on my CC status. I was lucky because in the end i do not need to pay a single cent when i received my CC statement.