HUNDREDS of complaints about myki have flooded into the Public Transport Ombudsman, a body set up by Victorian train, tram and bus operators to deal with complaints from Victorian commuters.

The news comes as figures released to the state opposition show ticket revenue on regional buses has fallen since myki was introduced.

A Myki ticket machine at a Collins Street tram stop. Credit:Craig Abraham

The $1.35 billion myki card, three years late and $350 million over budget, was introduced on buses in six regional Victorian cities from late 2008. It is also running on Melbourne's trains, but is not yet valid on the city's trams and buses.

The government will not say when myki will be fully operational. Last year, problems with myki malfunctioning on regional buses led to drivers often waving passengers on board without checking their tickets.