[Resolved]  Flipkart — my order gets cancelled automatically

I order redmi 5a of grey colour and of 16 gb memory it was processed by the seller
But it was automatically cancelled without my permission i contact flipkart toll free number they are telling that it was cancelled by courier boy i want seller number so that i contact with him about my phone i get this phone after two sale now if the price of this phone are hiked who is responsible for that