I got one strange but Unique way to put the scammer down.
Why not Let's start cloning there everything like their Website,Phone Number,E-mail & their Payment Gateway. OOOooo Sorry Payment Gateway will be tough as well as risky also Because there are encrypted too strongly at least they are having 256-bit SSL So,Leave It for the next time.And Let's start spoofing their all stuff.
1)They will be getting the call from their own Number.
2)They will be also getting spam Payment into their Inbox.
2)Their Website will be also cloned In Case If they are having Customer Detail or any kinds of Information into there Website.Most of them are using Shared hosting which can be accessed.