Olx India — mobile sale on olx india

I want sale my android phone i uplaod my phone in olx india app
Then after me come a call from rajsthan that custmer name - ratti her paytm account - ratti[protected]@paytm and he said to me
You give my a/c no and i am send a boy take your phone and i will payment online and then i send my google a/c and then he fraud my a/c and 9000/ amt debited her account. Her custmer contact no - and whatsap no - [protected]

Please help me