India Post — missed/stole my item

Address:	680307
Website:	www.royalmail.com

I purchased an item from mobilefun online shopping website on last month and they dispatched it on 17th april 2018 through royal mail international sort (From uk). On 1st may 2018, the postman gave me the invoice bill only. Not the parcel. And i asked about the parcel, and they told me, they dont know anything, they only got this invoice bill. I contacted the company from where i bought the product and they said they sent the parcel with the invoice bill. And the invoice bill was inside the parcel box. Royal mail didn't provide tracked service to india. So i can't track it. So where is my item? My reference no.20232172...