Broker Changed Commission Split / Won't pay on current agreement

[Account Closed]

Hello, I just wanted to get some insight on an issue I had recently in regard to my commission split.  I had closed many transactions in the past several years and my commission was split correctly, up until I had my highest sale / transaction ever, this past November where I was the dual agent on a $1,305,000 transaction. My broker, without advising me first, split my commission completely differently on this particular transaction than he had on any other transactions prior, resulting in a loss of $6700 on my end. I come from a market in PA where the average sales price is $200,000, so this was a HUGE deal for me. I had gone back and forth with him several times in discussions, and he basically said he didn't care that he split my commission completely different to favor the company and I just had to suck it up. What can I do? Is it worth hiring an attorney and switching brokers? Trying to close the wage gap with a greedy broker is impossible. :(