Contract question

Good Morning
I was offered a job from a very reputable company, and it had a Patent Invention agreement. They changed contracts on me when three weeks into my start date ( details are irrelevant to my question at hand ). They also got my name wrong on everything, my paychecks, insurance, 401K,...I mean drastically wrong from Billy Bob to Yusof lets say. I did not cash any of the paychecks, and my total activity was a month and half. Is the contract valid? If they challenge me in a court to enforce the Patent, can I make the argument that a court enforceable contract has to have a valid name? Given that they prepared the form, aren't they responsible for ensuring the accuracy of the contract?