You did not lay the method out - you gave some general information, he then paid and then you gave him more information.
Once he saw the whole picture he realized what you are selling is illegal.
https://prnt.sc/s7yzev
You say it is not but it is certainly illegal to send fake signups to CPA networks.
https://prnt.sc/s7yzmh
They have to sign up willfully.
Except that we are not sending fake signups, it's real people looking for services to be provided. It's like if you paid me for each lead that's interested in buying links, but I sent you people that are interested in paid traffic, for example, then obviously, those leads won't count. Now, if I sent you leads interested in buying links but I also sent them to other few link providers, everyone wins. EXCEPT, that the networks don't pay you for ALL the leads you send their way, and that's why this method is so profitable. Obviously, fake leads or aggregated leads will never work.
Now, if OP wants to solve this, my offer is on my first post in this thread.