JQuery :: JSONP - Error / Complete Event Not Firing

I have some jQuery making ajax requests that works just fine if the server returns a 200 but whenever it returns any error HTTP status none of the events fire. It's happening on more than one request to different servers but I'll just include one example for now:

var ajaxResponse = $.ajax({
url: widget.serviceURL + 'customer/createAjax?'+$('#ndBookingFormStep1').serialize(),
dataType: 'jsonp',
success: function(data, textStatus, jqXHR){
console.log(data);
if( data.status != 'OK'){
widget.message(data.status);
} else {
console.log(data);
}}})
.error(function(jqXHR, textStatus, errorThrown){
console.log(jqXHR);
}).complete(function(jqXHR, textStatus){
console.log(jqXHR);
});
console.log(ajaxResponse);
console.log(ajaxResponse.responseText );

The request gets made just fine, I can see the response in the net console in firebug and it returns the data I want with a 500 when I do not complete the form correctly. However, it does not fire either the error or the complete function when I get this status, and the ajaxResponse.responseText is undefined when it is logged to the screen. When the form is completed and the request is successfull the success function fires just fine.