Riversweeps complaint: Scammed

I have an issue with a Riversweeps sponsor. We both agreed on a $40 Cash Apps deposit The following day, i asked him how much longer. His reply was to send $30 more because he hadn’t noticed there was a minimum of $70. Which i did through a different Cash App tag. Hours later, I messaged him asking why it was taking so long. He said it was my fault there was a delay on loading my deposit into the game because i didn’t include my Riversweeps pin number in the Cash App. After rereading his Facebook instructions, i told him i didn’t know i had too. He said i should have asked him and the only way the $70 would be loaded is if i send $30 more but to include the pin on Cash App. That would fix the problem. I told him i was not sending anymore money and asked to return what i have sent him. He said if he did, it would cost him a loss. I told him he was only trying to scam money. He argued sending me a photo of a certificate (which i have included). Then he blocked me from his Facebook. Now i have no communication with him and he kept my $70. I have screenshots of our messages and the receipts of Cash App. I have filed a complaint in complain.biz.