How do i get 120v @60Hz 400VA?
If this is an old fashioned wire wound transformer, the 60 to 50 Hz will not matter, going the other way makes some difference though. If it's some sort of electronic switching transformer, it could be a problem, I've no idea.

The voltage difference is obviously a problem. The 400 VA is volt-amps, or watts. You don't need to get it, it just happens as a result of applied voltage and resistance in the windings. 400 watts isn't a huge amount of power, you may be able to find a step down transformer intended for travelers from North America. You may find such transformers cost more than the device you have. You may be better off getting a proper transformer and writing off the amount spent as a lesson learned if you are unable to return it.