stone delivered instead of mobile phone

I am sachin gopal tawade, i have order one mobile (model-karbonn a29) snapdeal order no 5802781112 from snapdeal on 14th april 2015.
On 17th april 2015 i received a box throug. Go javas courier awb no UNISNPP1365647 (courier boy-shrikant, contact no 07666140189), when i open the box in the front of courier boy i shock because i received a stone (a marbel piece) in the box instead of mobile phone.
Please help me to sort out my problem.