Olx Seller - Package never shipped

I have been searching for an iPhone *s since a long time , on **jan**** saw an ad for **k , negotiated till **k , agreed to pay *k once he ships the product , seller sent me the docket number after a while , saw it and paid the *k , he told me that he has shipped the product , and I'll get it on the next day via Blue dart.
Once I checked the docket number is was untraceable.
Next day I waited for the product (**th Jan ****) ,
Never received , seller didn't pick up the call for a day , in the evening when I contacted him , he told me to check the local bluedart office , once I went there officials told me that the docket number is fake , and the said reciept is fake.
My **** RS are lost. My hard earned money.
I hope to never use olx platform and will tell Everyone not to do so.