Quikr — not received the product and seller is not even answering the phone .

I recently saw an add regarding second hand one plus 7 pro and the seller name is sameer his no. Is [protected] we have conservation over whatsapp and had an whatsapp call to then he said so fir le rahi ho na pakka then he said apko payment quicker ko karne padegi and one more thing he was a trusted seller and then a quicker employee contacted me gave an upi id for transaction and after payment he gave me a bill also as a prove that from quicker and said product will be delivered in 3 to 4 day and now no one is answering my call. This incident is of 10th march and please look into this i want my money back. Contact me on [protected] i have the upi address and transaction id. Plzz look into this...