How can i report a scam client

[#1]

Hi everyone, my name is David, and I really need help reporting this client, **Edited for community guidelines** He posted a job on Upwork about a week ago, and I applied just like every freelancer on this platform. He then messaged me on Upwork that he loves my samples and would like to work with me on his scriptwriting project. He then asked me if I had a Discord account, which I did, and we started to converse outside of the Upwork platform. I wasn't worried about this move because it wasn't my first time handling jobs like this outside of the Upwork platform. But after doing 6 scripts for this guy, I then asked for payment, and immediately he blocked me and also removed me from his Trello. Please, how do I ensure this guy doesn't do something like this to another freelancer, and also, is there any way I can get my payment from him?

[#2]

If the Terms of Service were not followed by communicating outside Upwork before having a contract in "My jobs" tab, there is nothing Upwork can do. You can however flag the job as inapropriate and look at the Academy tab at the top of this page to learn how to stay safe and avoid account suspension.

[#3]

Flag the job..but for payment, sorry, just move on and try to get new client's. Don't accept to work with new  client's outside Upwork platform. 

[#4]

The disturbing thing about your post is that you say, "I wasn't worried about this move because it wasn't my first time handling jobs like this outside of the Upwork platform."

According to Upwork's terms of service, all communications (and payments) must be through Upwork's platform before a contract is in place to avoid violating their non-circumvention clause.

Did you have a valid Upwork contract with this client?

Either I'm misreading your statement, or you've intentionally violated Upwork's non-circumvention clause numerous times.  Which could ( and should) result in your account being suspended.