Can you contact China post and to know that problem is ? RB781636289CN

Hi, my tracking number RB781636289CN. 3 manth I waiting my product, but product 3 months in one locatin TIANJIN..... Why ?
I from Lithuania It's europe. In my local office didin't see information about my order. Can you help me to know there me product? Can you contact China post and to know that problem is ? RB781636289CN