If you had an actual written employment contract for a defined or definite period of time (e.g. a one-year contract) and the employer is violating it in some way, you could sue to enforce the terms of the contract (e.g. get any raise or benefits to which the contract entitles you). However, if it is not an actual written employment contract, you are an employee at will and an employee at will has no rights to a given job or duties or pay or benefits: the employer may determine, set, change, alter, etc. all aspects of an employee at will's job whenever the employment wants. So without a contract, your job, your pay, your benefits, etc. are whatever the employer wants them to be.Because an employee at will has no rights to a job and may be fired at any time, even the day they show up at work, that you left another job is unfotunarely irrelevant; not having a guaranty of a certain job or pay, you cannot sue or get compensation if you don't get it.