You have no right to sue. You certainly have a right to complain.
I've been in business for a long time. I've run into many vendors who didn't breach a contract or the law, but chose to do business in a way that impacted my business in a negative way. This has ranged from enterprise software vendors to janitorial services.
Ultimately, it hurt then in some way as we priced their bullshit into the next procurement cycle.
When a giant company pretends that some random afghani dude working as a contractor is a peer to any other vendor, that's either delusional thinking or a justification for bullying.
When The US referred to targeted assassination in Vietnam as "termination with prejudice", it didn't fool anyone.