NOC

I worked 9 months with a private co as a manager. I was asked to resign with a promise to give NOC with one month notice (as per contract 2 month notice if employee resigns). HR sent me email on the first day after submitting resignation confirming to provide NOC. On that assurance, I searched jobs here and when approached for NOC after getting job, they refused to give NOC. After more request asked to show offer letter, then submitted again request letter as they wanted. Still I am being troubled and waiting for NOC.
Now, if finally they don't give NOC and cancel my visa, can I lodge complaint with CID or labout dept or with both as I have email proof of confirmation to give me NOC.