Collected phone ****med olx client

I sold an iphone 5s to a Michael Simmons and he said he will send one of his drivers to pick up the phone at clearwater mall. A guy called Sipho picked up the phone. He was driving an Orange Cab with registration number CV34JH GP. This morning it was brought to my attention that my phone needs to be returned to me and I spoke to Sipho who kept on saying I must pay money into his account for him to deliver my phone back to me. Please be advised that these people are ******** and trying to **** as many people as possible. I told Sipho that he can bring the phone to me at clearwater mall same time same place but he kept on wanting me to pay money into his account. This is big time ********. If my phone is not returned to me I will be going to the police to open a theft case against Sipho.