I am an spanish attorney
I am sorry to say that you could put a claim in the border police station, but I think you really were wasting time
The law gives them the right to do what they have done it and to put the fine they have put
So, in my opinion your best way to manage its to pay and gorget them
Another way to fight its wasting time
You could write if you want
According to the law http://noticias.juridicas.com/base_datos/Admin/rd951-2005.html
You could put a claim in the police station or by written
But I tell you in advance that its wasting time
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