Contract signed initially says 2 years, before going to place of assignment,contract changed to 2.5 years

I have to answer your question with questions. Did you read the contracts as amended? and if you did not agree to the changes could you have not signed? Fraud is when they tell you one thing and do another, here they just extended the time , a change yes but because the time for performance was close to the same and you could have said no, I guess and that is all it is, that it was not fraud but a voidable contract. Meaning you could have cancelled if you did not want to perform.

Good Luck