Dear RT according to the actual immigration rules if you are canceleld you have to leave the country and the Ban priod is 2 yrs.

NOC is mandatory for those willing to come back and keep on working; however the NOC issuance is at the sole discretion of the employer.

Doing as some say here to come back on business visa (black market=illegal=problems) and exit and re-entry periodically can also get you in trouble.

Regards!!