First off, don't take this as me defending joker as it's clear he owes you at least some money...
Now, your links and other information are about as clear as mud. You need to help yourself by presenting the info in a more clear and easily accessible manner. Based on your actions in the thread the chance that you do this is practically zero but whatever.
Even joker himself basically said he's not paying because you guys seem to be in disagreement about the sum owed.
I'm again not supporting his position but I can sort of see his point. He comes back from his unauthorized break to find you've blown his world up and also (from his perspective) apparently doubled his debt.
First step: clear up EXACTLY what the true amount of the debt is.
Second: see if he will agree that he in fact owes that amount
From there I'm not sure what to say. But at least he's on the hook for that amount and you will get a lot more support from the community.
Or alternatively, just leave this thread as is and enjoy your own sullied reputation.