This is the problem when you break the law. You cannot go to a criminal federal judge and make a complaint and send them to jail because, for that, you have to confess attempt of contraband that has the same punishment than contraband. almost 5 up to 15 years of jail.
And of course that the customs agents know that and they might take advantage.
I don know if you know but there are many regulations regarding the products from China. Bikes for example,they might cost 5 usd at whole sale prices while they cost 50 usd to produce it in Argentina. So, no matter how much does it cost, it pay taxes like a 50 usd cost bike.
Under a situation like this, you have to hire a despachante de aduanas (I think that's the rule when the item cost over 200 usd???) and then it is not affordable.
But this is all guessing because I m not a despachante de aduanas.
Next tome use mercadolibre:
http://listado.merca...ar/voltimetro#D[A:voltimetro]