Caller: Fraud Visa card call

An Indian guy told me I have two large transactions which seems unusual so asked me if I wanna authorise them or block them. I immediately felt this is a scam call hence I played a bit with him. HE asked me to open up my web browser then asked me to enter some letters in the search section(totally a fraud tactic) then ask me to enter an authorisation code when the website asked me to. I did not do what he told me to do then he blamed me for wasting his time. I hung up after this.