i had sent him my nvidia GC for warranty purpose. last message he sent to me said that he had posted back my GC to me. i asked for the tracking number, and until now he hasnt answer me and i dont get any GC (he claimed he had posted it).

called his hp number .... "harap maaf, kami tidak menerima sebarang jawapan dari nombor yg anda dail, sile cuba sebentar lagi." 

what should i do? anyone knows him or can contact him? he hasnt log in since 15th dec.