mohdata: From what I recall when the new rules were brought into effect some years back, I believe that if an employer is not willing to give an NOC, the employee cannot come back for a certain number of years (possibly five years.) The requirement of an NOC gets waived if an employee has worked in a company for a minimum five years. Also, from my knowledge, the Labour Office does not get involved in matters of getting an NOC for an employee from the employer. The issuance of NOC or its refusal, is totally in the hands of the employer.
Lastly, as for the cancellation of RP. I believe it should be done by the employer once the employee goes on final exit or it should be automatically cancelled by the authorities in such cases. But I get to read so many posts at QL where people seek advice on what steps he could take when an employer hasn't cancelled the RP even after the employee has exited Qatar and they are as such unable to come back on another job. This makes me really wonder if employees still remain at the mercy of employers even after they have ended their contract and left Qatar.