Can an employer not pay commision on a 100% commision job after you quit?

I recently quit a 100% commission job. An employee gets paid when a job gets installed, not when payment is collected. I quit before several large deals went in the ground (I had to), but contracts were signed and paid for. The deals are changed to another rep manually by the sales manager when this happens, and the agreement verbally (and by culture) is that that rep will pay the ex employee back for the amount minus their taxes. I have done this twice for other ex employees (they have a lot of turnover) and even my manager had this done when he became a manager as we all feel it is an unfair practice. The deals have since been installed. The rep I decided to give it to has decided not to pay me (even though this helped him out as payment is paid out in tiers, the more you sell the more you get per deal). It seems to me that for a 100% commission job the employer either considers its comp plan fair pay for work done or it doesn't, it cant change this if someone decides to leave. The kicker here is that the comp plan does not outline how this works, it simply states what someone would get paid. I am wondering if I have a case, or if I would be able to report this to the department of labor. The amount is a little over $2000.

Update: There was a verbal agreement between me and my manager to transfer the sales and get paid by the rep later.
Also, I assisted with the largest of the deals speaking with a vender required to complete the transaction and helped coordinate their arrival AFTER I quit. This is documented on my phone. I did this at the request of my manager, also documented.

Also, I was a W2 Employee with benefits.