Advice wanted on client debt recovery

Miscellaneous Forums/General Discussion/Advice wanted on client debt recovery

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Does anyone have any advice on recovering a debt from a client who appears to be avoiding paying? After the guy being extremely rude to me at points on the project and me spending much over time on the project, which includes many weekends and late evenings leading well into the morning, the guy isn't replying to my e-mails and appears to be ignoring my calls - it even sounded as though he answered the call and then put the phone down. Any ideas of what I should do?

As he himself was a sub-contractor to an agency, who themselves were provided the work from their client, I've been thinking of contacting the agency about not being paid, then if they don't do anything, then contacting the end client because they are using my work on their website that I haven't been paid for. Do any of you think this is wise?