Delivery agent refused refund of double payment

It was a Pay on Delivery order I asked delivery agent to send me the payment link instead he urged me to transfer the money to his personal bank account via UPII transferred ₹1,299 via PayTM but transaction was not successfulNow the agent can't leave the product with me and leave without payment. So I made a transaction of ₹1 from my other bank account just to check whether there's gonna be a problem again. It was successfulThen I transferred 1,298 and was successful immediately. So now I've paid double - ₹1,299 ₹1 ₹1,298 total of ₹2,598. I was promised to reimburse ₹1,299 if the 1st transaction is successful laterAt a later day, I contacted my bank to enquire about the failed transaction of ₹ 1,299 and my bank confirm me that the transaction is now successfulI contacted the delivery agent and asked him to refund the ₹1,299 but he kept saying he didn't received the amount and refuse to refund the amount of ₹1,299.