Prosper maliciously cancels the bonus to customers

I made a deposit in Prosper before and lost money in the transaction. Prosper gave me a bonus of $7600. Every time a transaction is made, the profit can be withdrawn. I recently made a profit of more than 500 US dollars, and I also raised it. But prosper maliciously canceled the bonus. I want to complain, prosper has no principle in doing things and treats customers casually.