If I where you I would get them on the phone and talk about it.
Perhaps make some kind of settlement where you can kiss goodbye to some of the money.
Show them the e-mail where you asked about the linking codes directly to the join page as well.
If they can be replaced with another sponsor you can also tell them that they should pay up, switch sponsor and take it to a civil court to get them to show the log files and pay up.
I have before solved disputes (only a few K on the line though) by removing all links and sending to someone else, then call them and tell them that we need to get this solved, because I would like to continue to send traffic, but not before I received all my money.
Remember when you are on the phone with them never raise your voice or say anything that can piss them off, it will just be a slap back in your own face. Keep it on a proffesional level no matter how much it sucks
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I buy plugs
Skype: Due_Global
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