Looking for legal advice from lawyers?

I worked for a company as a sub-contractor. They work for banks doing property preservation services.They owe my company more than 10,000 dollars and refuse to pay it all. The first check they sent was not endorsed, the second one is not the right amount and has omissions and the third one has never arrived. They have put my business through financial hardship as well as the people who work for me. What should I do. I know I should sue them but for what? Breach of contract? Fraud? I want to be compensated for my losses. Not only that but I have looked them up online and they have a lot more victims than me! HELP!

Also please do not comment if you don’t have anything useful to tell ( you know who you are). Sorry this is for people who post their own soapbox opinions i have seen one to many times. Thanks
I am in Illinois

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