CH Robinson reopen claim

Has anyone else had issues with CH Robinson reopening closed claims? This summer they tried to open a claim on me but I sent in the evidence & was found to not be at fault- I got paid case closed. Now 6 months later they have reopened this claim & are holding a payment from a recent load I did for them unrelated to the one they have a claim on. They even sent me the original photos I had sent them from the summer as my evidence as THEIR evidence against me. They tried to get me to sign some paperwork saying I would get my money when the paperwork clearly stated I would be accepting fault & responsible for they payment. Anyone dealt with this? Or any insight to my rights? At this point I want to get an attorney

 

Would you by chance know where I can find information about this law so I can out it in their face?

 

Thanks everyone! I am 13 hours total arguing hours into this- Every time I shut down whatever bull they are telling me they come up with something new-

 

I was randomly informed of that by one of their reps- I have never mentioned/implied anything about lawsuits or claims during this situation & during one of the conversations the rep said "You can sue us if you want but the last guy that tried it can't work for us anymore" I asked if that was a threat because I had never said anything of the sort & they said they were just letting me know. Between my dads o/o trucking career & my own I have never dealt with the Twilight Zone levels of ridiculousness from a company before.