I don't want to invest in immigration. Can I apply for a refund from the intermediary?

This is definitely refundable. Just ask your agent to write a letter for you and send it to you for application. It usually takes 2-4 weeks to return it. As for the intermediary's money, if they give you a lot of materials, it is estimated that it can't be refunded. But there is a possibility, if that $ 50w has been invested. I don't think I can return it. So I suggest you go to the intermediary to find out the situation.