So I was working on a project with a company and part of they way through doing it they changed my contract. See the thing is they never told me that they were changing how much I would be payed. They told me they wanted something else done and I agreed to that but not to a cut in pay. Are they allowed to do this or is there some rule against it? I'm from the US(the company is too) and I know both parties have to agree before a pay cut can happen but is this true?