Please note that you do not have any claim over self cheque because you are not the payee; it is not issued to you. Issue legal notice claiming your amount. if they refuse to pay, file a petition before Jurisdictional labor commissioner with all documents including self cheque given to you.
All the best.
M M SHETTY
Please consult me personally for your case and I can help you with the same. The fee of consultation/drafting etc shall be dealt later on. I shall need all inputs from you and thereafter we can proceed. Consult me if you need any legal assistance and I can help you with the same. Thanks Adv. Munish Goyal