Spanair lost luggage; no contact for 7 months

Spanair lost our luggage on our flight from Zurich, Switzerland to Barcelona, Spain. Despite numerous phone calls and three letters requesting compensation, we have yet to be compensated. Phone calls to baggage services of Spanair are absolutely fruitless, as no one I've spoken can give me any information, except that the bag is still missing. I have never been able to speak to someone who is willing/able to tell me what is being done to locate my bag or to get me compensation for the lost bag. Spanair is like a vaccuum this way, and the kicker is that calling them is a very expensive international call! Three letters requesting compensation have also gone unanswered. I am so frustrated because it seems like there is absolutely no recourse for this horrible treatment.