Quikr - Refusal to transfer money for delivered product.

This is for quikr ad ID : ********* which i posted for Rs *** and was sold via Quikr Doorstep. The buyer had already paid Rs.*** to quikr where Rs. ** was charged convenience fee. Now the product was picked from me and then delivered to buyer on *sep**.
However the quikr team is clearly lying that it has not been delivered and its in transit, so they cannot initiate the transfer to me. I have personally checked with the buyer that product was delivered on *th sep. And also it shows on their app that delivery schedule completed on *th.
But somehow they are lying ans holding my money. This is also after they are deducting Rs ** as convenience charge from me as well.