What I did wrong is that I belived that RCModel was honest guys as all the other stores I bought from earlier on in for ex. Hong Kong but they were not.
I used their ticket system instead of paypal-complaint and since they helped me out on how to return the goods I thought that refund would not be a problem and when I finally understood that it would be an issue, 45 days from payment had already passed and paypal could not help me out.