It depends on the state. My home state, which is where I performed the bonused shop, has a section of the Consumer Fraud Division dedicated to complaints by Independent Contractors.
They had an online form on the state website to print out and mail, which I did. I also scanned the complaint form and sent it as a .pdf file. Worked like a charm.
You've also got the option of going to Small Claims Court, where they could be liable for triple damages plus court costs -if you shopped in the same jurisdiction as their home office.
I would not contact the Swedes. Two reasons:
1. It could be construed as a violation of your ICA, even though they violated theirs first by not paying in a timely manner.
2. Sad to say, it probably won't work. You are a sub-contractor to their mystery shopping contractor (Cirrus 360.) The Swedes, busy as they are, probably aren't going to put your concerns high on their priority list. They will say that whatever business dispute you have with Cirrus 360 is none of their concern. It's no different than if Cirrus 360 isn't paying their rent or cable bill or bounced a check at the postal supplies store. They don't have the time to deal with it, and won't involve themselves in your particular case.
OTOH, the Swedes may want to know of pending legal action against one of their contractors.
What is the forum's opinion on this topic? In my case, after I threatened legal action and subsequently was paid, I self-deactivated and left it at that.
Thoughts? This kind of behavior really makes me angry, in case you can't tell....