unpaid wages for 1 month

I am a newly hired faculty member in a school. I was hired June 25, 2012 but havent receive my compensation. I already signed a contract with the school. I applied as a Math Instructor unluckily the head of the school gave me subjects which not of my expertise. As per the contract that I have signed it is noted there that teacher should have given teaching loads aligned with their specialization. I do want to resign due to late salary but it is clearly stated in the contract that the faculty could not file a resignation in the middle of the term. I have asked our HR when should expect my salary she told me that she is not sure but promise me that it would be given not later than september. If i will quit the job and they file a case against me can i use the delayed salary issues to defend myself? As i reviewed the contract that we have some of the articles there are not practiced in our school. Please help me. Thanks.

september sounds too long. make your follow up in writing.

yes its quite too long for me especially i am supporting my parents' expenses. I am planning to quit the job and find another one because if i will be hired on another school i will receive my compensation immediately with other employer of which i can help with expenses in our house. Is it ok if i look for another job and quit the job in my recent employer?

yes, non payment of wages is a valid reason for resigning